Compsognathus “triassicus” (*) (S/F) / (S/F-T/G)

Compsognathus, also called the “compy,” is a genus of small theropod dinosaur in the family Compsognathidae which grows to roughly the size of modern-day turkeys. This animal lived in what is now Europe, with specimens being recovered from Germany, France, and possibly Portugal; between 156 and 145 million years ago, during the Tithonian age of the Jurassic period, these areas would have been tropical archipelagos. Its genus name means “delicate jaw;” there is only one species, C. longipes, with a specific epithet meaning “long foot.” Despite its small size, it is believed to have been the top predator in its habitat simply due to the fact that no large animals have ever been discovered there.

The first known fossil of Compsognathus was discovered in Bavaria, Germany in the Solnhofen limestone formations by fossil collector Joseph Oberndorfer. These limestone quarries were already known for excellently-preserved specimens of fish, pterosaurs, and small dinosaurs such as Archaeopteryx. The species was named by Johann A. Wagner in 1859, the same year it was discovered. Compsognathus was instrumental in forwarding the idea that birds are a type of dinosaur, based on the similarity between Archaeopteryx and Compsognathus.

Concept art of a Compsognathus

This first specimen measured 35 inches (89 centimeters) in length, making it the smallest known nonavian dinosaur at the time of its discovery. Over a century later in 1971, a larger specimen was discovered in the Canjuers plateau near Nice, France; this skeleton measured 49 inches (125 centimeters) long. Originally, the French specimen was classified as C. corallestris, but it was eventually identified as the same species as the German specimen by various scientists in the ensuing years.

There is only one recognized species of Compsognathus today. It is sometimes confused with the earlier small theropod Procompsognathus triassicus; most modern scientists disagree with the earlier theory that there was an evolutionary relationship between the two animals. Paleontologist Dr. Robert Burke has confused the two species, referring to C. longipes as C. “triassicus,” a name which is nonsensical as Compsognathus had not yet evolved during the Triassic period. He also identified it as having been discovered “by Fraas in Bavaria in 1913,” a description that is applicable to Procompsognathus. Jurassic-Pedia has opted to use the incorrect taxonomy for unknown reasons.

Compsognathus longipes was one of the theropods cloned by International Genetic Technologies in the 1980s and 1990s. This was accomplished using ancient DNA preserved in amber inclusions dated to the Jurassic period within hematophagous invertebrates such as mosquitoes. While it was not successfully exhibited in a de-extinction theme park, its adaptability has made it one of the most prolific of the animals created by InGen. It readily establishes itself in new environments without human assistance, making it one of the few de-extinct vertebrates with real potential to become an invasive species.

As of June 11, 1993, InGen had created up to Version 2.050 of this species.


Among the smaller dinosaurs, Compsognathus reaches a maximum length of four feet (1.2 meters). InGen’s specimens rarely reach these dimensions, remaining closer to the juvenile proportions and scarcely growing larger than a chicken. Fossil evidence suggests that, when at its full size, Compsognathus would weigh between 1.8 and 7.7 pounds (0.83 and 3.5 kilograms). However, some sources suggest that the biggest of InGen’s specimens could reach a height of two feet (60 centimeters) and a length of five feet (1.5 meters), weighing up to eleven pounds (about five kilograms). This would mean that, while most of InGen’s compies are smaller than their fossil relatives, they have the potential to grow larger than known fossils provided they are not eaten by predators first.

These quick, nimble creatures are skinny and lightweight, with much of their length consisting of the thin tail and dainty neck. The skull appears delicate, but is actually armed with a strong jaw and dozens of small, needle-sharp teeth. In the front of the jaw, the teeth are smoother and lack serrations, while the teeth in the rest of the jaw are flattened from side to side. The large eyes are equipped with equally large pupils, which are round like those of a diurnal bird, and dark brown sclerae. These allow it to make precise movements with its neck and head, quickly striking to nip at a piece of food and then pulling back. Overall, its skull is narrow with a tapering shape. There are venom glands in the mouth.

Its body usually appears scrawny, though this depends on the environment; when well-fed, such as in an environment with readily-available carrion, slightly plumper Compsognathus can be seen. Their narrow frame is essential for their survival, though, since they rely on speed and agility to capture food and avoid predators. Compsognathus is aided in this endeavor by its long tail, which is useful for balancing while running, and by its long legs and feet. The three toes end in small claws. A fourth toe, called the hallux, is vestigial; it completely lacks a claw in some populations.

The front limbs are much smaller than the hind limbs, but are still functional and can be used to grasp prey. Paleontologists are still unsure as to whether Compsognathus naturally has two or three functional fingers; the general belief for many years was that only two of the digits possessed claws, and that the third finger was vestigial. Some scientists disagree, however, suggesting that the third finger was still more developed. InGen’s specimens do only have two functional fingers, each of which ends in a small claw; as with all of their theropods, the hands of Compsognathus are capable of pronation, which its fossil ancestors’ were not. The third finger is reduced in size, and is entirely absent in some populations.

Note this compy’s clawed hallux and reformed third finger. These are traits that have appeared in newer generations of Compsognathus.

In more recently-developed populations, the vestigial digits of Compsognathus have become slightly more prominent. Animals seen between 1993 and 2001 were typically found to lack the third finger and fourth toe, while those found in more recent years can be seen to have them. Whether this can be attributed to genetic engineering or naturally-occurring genetic drift is presently unknown.

Many relatives of Compsognathus were covered in down-like feathers, but at least InGen’s specimens lack this integument and are instead covered in smooth scaly skin. Paleogeneticist Dr. Laura Sorkin suggested that genetic engineering may have unintentionally removed feathers that would naturally have grown on Compsognathus (as was later determined to be the case in Velociraptor and other theropods); however, some fossil evidence suggests that not all compsognathids were feathered, and that Compsognathus itself may have indeed been scaly on at least part of its body in prehistory as well.

To help it survive in its environment, compies are colored for camouflage with variable green coloration ranging from a dusky evergreen to a more vibrant yellow-green; rare reddish-colored compies are also known. Nearly all have vertical stripes, typically a fairly dark blue or green but sometimes gray, which help them to blend in with tall grasses and other plants. These stripes are present on the back, neck, and tail of most specimens, and are accompanied by horizontal stripes of the same color on the legs of some. It exhibits countershading, with the underside appearing a lighter color than its back. Under its neck, it has a dewlap, which is reddish in the male and likely functions as a display structure. During most times of the year, this dewlap is reduced in size and faded in color, becoming more pronounced with seasonal changes. At least one melanistic compy, with black coloration, has been seen.


Thus far no hatchling or juvenile Compsognathus have been observed, but InGen’s specimens are similar in proportion to the juveniles and subadults seen in the fossil record.

Hatchlings can be created in the mobile game Jurassic Park: Builder, appearing proportionally similar to the adults.

Sexual Dimorphism
Female (upper) and male (lower) Compsognathus

Though subtle, sexual dimorphism is present in Compsognathus. Males are a darker, more vibrant shade than females, which have a more faded color. However, individualism can obscure this, as some are lighter or darker than average. It can be difficult to sex an individual compy without a visual comparison. One fairly reliable way to sex a compy is to check for a dewlap; especially during the courtship season, the male’s dewlap is enlarged and red.

Preferred Habitat

The compy is an adaptable creature, capable of acclimating to a variety of habitat types. Its coloration makes it best suited to grasslands and bushes, where its green scales and distinct stripes help it blend in with its surroundings to avoid predators. However, it also flourishes in forests, particularly those with thick undergrowth or large organic debris. Compies have been known to inhabit semi-arid regions, marine coastal areas, and wetland, all with a good degree of success. They have even been seen in developed areas and farmland. Its prehistoric habitat is believed to have been dry but tropical archipelagos surrounded by flourishing coral reefs.

In the game Jurassic World: Evolution, a Compsognathus requires 578 square meters of forest and an equal amount of grassland in its habitat.

Isla Nublar

As of June 1993, plans were in place to eventually house Compsognathus in a paddock in Jurassic Park in the central or southern part of Isla Nublar. However, this paddock was not yet constructed, and that area was occupied by other animal paddocks at the time.

Group of Compsognathus on Isla Nublar

Supposedly, no compies were present on Isla Nublar in 1993 at all. However, this assumption was proven incorrect during the 1993 incident and 1994 cleanup operation. A total of seventeen were spotted at the abandoned Visitors’ Centre during the evening of June 12, while more were sighted in the forest to the north of there. A further seven were sighted at the Western Ridge, while two more were seen in the northern forests near Dr. Sorkin’s laboratory. Seven animals may have been present in the area slightly later. In fact, Dr. Sorkin’s personal journal details her studies of Compsognathus, suggesting that she knew they were on the island already. Other staff members, including chief veterinarian Dr. Gerry Harding, were also unsurprised to see these animals on Isla Nublar. This suggests that, while they were not supposed to be on the island yet, their existence was known to much of the staff.

All together, there may have been as many as thirty-three adult compies on Isla Nublar by June 12, 1993; however, it is also possible that some of them were simply seen more than once, and equally possible that there were others on the island not seen at all. The 1994 cleanup operation counted twenty-eight animals as of October 5, stating that they had probably stowed away on cargo ships from Site B. If this is the case, they probably entered Isla Nublar via the East Dock.

Confirmed (red) and hypothetical (purple) range of C. longipes on Isla Nublar as of June 12, 1993

The population persisted on the island for years after it was abandoned in 1993, easily becoming the most numerous de-extinct species. Isla Nublar provided them with a habitat in which to flourish, and they were still quite common when the island was recaptured by InGen in 2002. For the safety of park workers, the compies were confined to certain reaches of the island.

As of 2004, the compies were considered to be free-roaming over most of the island, since their small size and unknown number made them more difficult to contain than other dinosaurs. From late 2004 to early 2005, their population likely increased with specimens from nearby Isla Sorna being introduced to the island. After some time in the quarantine paddock, they would have been integrated into habitats in Sector 5. There is currently no evidence that they were successfully put on exhibit in Jurassic World, but they were maintained in a small pen near the Camp Cretaceous site as of 2015. Escapes were more common than other species, but not a major safety concern as compies are not especially dangerous. For example, an adult female escaped the pen on December 19, 2015 and encountered campers bound for Camp Cretaceous, but was easily captured by camp counselors and delivered to the Jurassic World Park Rangers for recontainment.

During the incident in 2015 which closed Jurassic World, multiple compies escaped containment as rangers and other security staff focused their efforts elsewhere. Three escaped adults were sighted on the road between the River Adventure and Jurassic World Lagoon during the day, and that night a group of fifteen were seen in a maintenance tunnel leading from the Golf Course to Ferry Landing. The following day, one male and three females were seen in the remains of a damaged gyrosphere just north of the valley, and a further thirty (including eighteen males and twelve females) were seen on Main Street nesting in the buildings. On January 13, a group of four including two males and two females was spotted at the Camp Cretaceous site. Five to seven more were sighted at a watering hole nearby, and on January 14, five were sighted near an illegal campsite some distance from Camp Cretaceous. Finally, on January 15, a pair of females was seen in the Ferry Landing harbor building, using the maintenance tunnels and damaged infrastructure to navigate around. These are the southernmost confirmed compies on the island.

The population survived well into 2018, adapting to changes in the environment after the park was abandoned. Artificial barriers were lifted around much of the island, permitting animals to roam as they chose. At least three, and probably five or more, were confirmed living in the North Mount Sibo Genetics Centre on February 17, 2018, including at least one female and two males. Some Compsognathus were recorded living near the aviary ruins, while one adult was sighted at Main Street on June 23, 2018. Many compies, however, remained in forested areas and grasslands to the island’s north. On June 23, 2018, four were sighted near a small creek to the south of Mount Sibo, while three more were sighted southwest of the mountain. A further sixteen were seen on the volcano’s eastern flank; these compies were driven eastward when the volcano erupted, and were forced to scatter to avoid a stampede of much larger animals.

In addition, at least eight adult compies were removed from the island by means of the S.S. Arcadia under the direction of Ken Wheatley. The last one to be logged into the ship’s manifest was measured to weigh three kilograms, or 6.6 pounds; it was kept in Container #31-1022-2647 (Cargo #24573) and cosigned into the manifest by Jon Brand at 14:01. It was highlighted in green in the manifest, likely indicating good health.

All together, this means that there were at least thirty-two adult compies on the island at the time of the 2018 eruption of Mount Sibo. With around thirty-three on the island in 1993, twenty-eight confirmed in 1994, and at least thirty-eight in 2015, the compy population on Isla Nublar was among the most stable over the course of these twenty-five years. Some compies seen in more recent years have a distinctly different phenotype than those seen during the 1990s and early 2000s, suggesting that they are not the same animals.

The eruption of Mount Sibo would have negatively impacted the compies. After feasting on the initial carnage, the compies’ food sources would have depleted. Without plant life, the insects and other invertebrates would have decreased in number, causing a trophic collapse impacting all levels of the food chain. Herbivorous animals would have died out, followed by the carnivores. Even the freshwater fish were largely killed off by toxic algal blooms and volcanic outgassing throughout 2018, depriving the compies of another food source. Ultimately, while some may have managed to eke out a living feeding on marine detritus and whatever small animals they can find since the eruption, most of the food that helped them flourish is now gone. Mount Sibo remains active, making the northern island inhospitable even to these remarkable opportunists.

Isla Sorna

InGen bred Compsognathus at the Site B facilities on Isla Sorna sometime between 1986 and 1993, though the exact date is not known. As of last headcount in 1993, there were forty-eight compies living on Isla Sorna. Their habitat could have ranged anywhere on the island; populations were later found to have established all across it.

In mid-December of 1996, a group of 21 adults was encountered on Isla Sorna’s northern coastline. The species was also sighted farther from shore in early 1997; between six and nine adults were found near the northeastern game trail on November 2, while a group of twenty-nine were seen in a wooded area north of the Workers’ Village on November 3. Of the game trail population, between two and eight were captured by the InGen Harvester operation. When the camp was sabotaged and destroyed, two caged individuals were not released and were directly in the path of a Triceratops attack. Six animals were seen fleeing the camp; it is unknown if the two seen in cages were among them. If the caged two did not escape, and managed to avoid being crushed in the attack, they probably starved. It is unknown if the six animals seen fleeing had been captured beforehand, or if they were simply lingering near the camp.

A group of Compsognathus interacting around a communal drinking puddle. Note the melanistic individual in the rear of the group, upper right side of the image.

All of these were mixed-sex groups, though the sex ratios are unknown. There appear to have been similar numbers of males and females. Behaviors in the compy flock seen north of the Workers’ Village imply that they may have been the same flock encountered near the game trail; however, the flock on the northern coast is most likely a separate and distinct population. Between 1996 and 1997, there were at least fifty compies on the island. If the two seen in cages on November 2 were not released, then there were at least fifty-two, and if the population in the central island was distinct from that of the game trail, there could have been as many as sixty-one compies on Isla Sorna at the time of the 1997 incident. Of course, it is likely that others remained unseen.

In 2001, more compies were encountered in the island’s western region. During Eric Kirby‘s time marooned on the island during the late spring and summer, he reported a flock of compies living near the western coastline as of May, though exact numbers were not given. On July 18, four compies were briefly spotted near the Site B Airfield, but were evicted from their nests by a conflict between two much larger theropods. During the evening of that day, a flock of at least eight were seen near the remains of a water tanker truck that Eric Kirby had used as a makeshift shelter.

The Jurassic Park Adventures junior novel series, particularly the second book Prey, describes a large flock of compies living near Mount Hood in the island’s southwestern region as of the very end of December 2001. The exact population numbers for Isla Sorna’s western regions are not known, but assumed to be comparable to the eastern island’s population. Only twelve animals have been specifically headcounted, but language used to describe compy groups in the west generally imply a large population size.

Known (red) and theorized (purple) range of C. longipes on Isla Sorna, 1996-2002

Without a doubt, Compsognathus was the most numerous de-extinct carnivore on Isla Sorna between 1993 and 2004. During the chaotic final years of Isla Sorna’s artificial ecosystem, compies would have been among the few creatures to really benefit; as the ecosystem collapsed due to overpopulation, the carcasses piling up would have fed the compies well. Even so, their numbers probably decreased dramatically after late 2004, when Masrani Global Corporation took the initiative to move animals to Isla Nublar for their own safety (and to stock Jurassic World). It is unknown how many compies were successfully relocated. According to Masrani Global and other authorities, there are no dinosaurs left on Isla Sorna; however, the island is still restricted for unknown reasons. Additionally, the small size and cryptic coloration of the Compsognathus would make it very hard to track down and capture every single one, and they have already established an ability to evade human containment measures and establish themselves in an ecosystem. This makes them the likeliest candidates to have survived the collapse and purge of Isla Sorna. Even if the island is truly emptied of de-extinct life, compies may still live there undetected.


Since 1994, there has been a precedent for compies as an invasive species. They were planned to be exhibited at Jurassic Park: San Diego in 1997, but were not successfully brought off Isla Sorna at that time; despite this, it is possible that they reached the Americas or other parts of the world during the late twentieth century via InGen cargo ships. The InGen IntraNet website, which was last updated in 1997, hints that a population of compies may have established at Toluca Lake in Los Angeles, California, USA.

Compsognathus harassing a young child at a location in the American West, 2019

It is possible that, owing to their close proximity, the islands of the Muertes Archipelago could all host Compsognathus populations that dispersed from Isla Sorna. No investigations into this possibility have been reported, however, leaving it as only speculation.

Compies were confirmed in North America as of June 24, 2018 when at least eight adults were transported from Isla Nublar to the Lockwood estate near Orick, California. They were intended to be sold on the black market, but were released from the estate by Maisie Lockwood to prevent them from dying due to hydrogen cyanide poisoning. Since then, they have been reported throughout the western United States, the population apparently booming in the ensuing years.

Behavior and Ecology
Daily Activity

This theropod is crepuscular, active mostly at dawn and dusk and avoiding the temperature extremes of midday and midnight. It may be seen intermittently throughout the morning and afternoon as well, during which time it hunts and socializes. When they sleep, they huddle together for warmth, safety, and comfort.

Diet and Feeding Behavior

Compies are carnivores, feeding on a variety of small animals including reptiles, insects, and amphibians. Some paleontologists such as Dr. Robert Burke have suggested that the compy was exclusively a scavenger, but real paleontological evidence contradicts this assumption. In their native Jurassic period, their diet is known to have included small reptiles, such as the agile lizard Bavarisaurus; in the modern day, compies may take prey that they could not have encountered during prehistory. Small mammals, such as rats and mice, are easily within the range of a compy’s prey animals, as are some of the smaller modern birds. It still feeds on lizards, frogs, and insects. It struggles to bring down prey larger than itself owing to its delicate build, so it usually targets small creatures that cannot fight back. The compy has mild venom, not enough to kill a human outright, but enough to kill small prey or weaken larger prey.

After being fed by a human, Compsognathus may learn to associate humans with food, leading to dangerous interactions.

To kill a prey item, the compy employs its excellent sense of vision to track the prey’s movements before delivering a quick, precise nip with its jaws. It efficiently immobilizes the prey before consuming it whole, or tearing off smaller pieces if the prey is too large to fit in its mouth. It also scavenges from carcasses, ripping pieces of meat from the body of a dead animal. Because it is much smaller than other carnivorous animals in its habitat, the compy must be wary when scavenging; at the first sign of a threatening competitor, it will scurry away. They have been known to dash in and steal dropped pieces of food from larger carnivores, but flee the moment they sense that they may be in danger.

Some compies are known to practice social hunting behavior. To incapacitate a larger prey item, one member of the compy flock will emerge and get the target’s attention. This is a risky move for the compy, as it could easily be killed should a large target turn aggressive. While the target is distracted by the lone compy, the others will move into position and mob the target from all sides, biting and tearing at any exposed flesh to create dozens of small bleeding wounds. If the target fights back too much, they will fall back and wait for it to weaken before moving in again, stalking it if necessary. Eventually, the compies can kill even a human-sized prey item if they are patient and careful enough. This behavior probably first developed as a defense mechanism against predators, since in prehistory, the Compsognathus lived on islands without any large predators.

Compsognathus hunting insects in a wetland, Isla Sorna (7/18/2001)

However, the compy is an opportunistic eater, and will take food any way it can. It has been known to eat processed meat products such as roast beef, cooked fish, and jerky, and has been observed scavenging other forms of processed food such as frozen pizza and chocolate. It is probably an experimental feeder, probing any new potential food to determine whether it is edible. When a compy identifies a food source, its fellows are usually not far behind. They will rapidly swarm any available food, devouring it before any rivals can show up to compete. Despite their frenzied meals, they do not act aggressively toward one another and appear able to share the food among themselves without much infighting.

In addition to consuming all kinds of meat, compies practice coprophagy, or eating the feces of other animals. This is an uncommon behavior among birds and other reptiles, but has been documented in mammals. In compies, coprophagy probably allows them to obtain nutrients that they could not normally get from their diet, such as plant-based nutrients from the dung of herbivores. As a carnivorous animal, the compy cannot eat plants, but it could instead consume the dung of herbivorous animals.

Some evidence exists to suggest that compies may eat eggs. Footprints belonging to this species were found near a Dilophosaurus nest, though there was no damage to the eggs. The parent may have driven off the compies before they could feed. It has also been suggested due to their association with Troodon pectinodon that they may eat the Troodons‘ leftovers, including organic material the larger animals use in nesting. During the 2015-16 incident on Isla Nublar, Darius Bowman confirmed compies eating the eggs of other animals. He also kept a record of their scavenging and feeding behaviors; he confirmed that their diet includes butterflies and moths, insect larvae, flies, centipedes, dragonflies, beetles, other insects, and carrion.

Social Behavior

The compy’s collective hunting technique probably developed from preexisting social behaviors. This is by far the most gregarious theropod cloned by InGen, forming tightly-knit social groups of nearly thirty animals. It is unknown if these are influenced by family relationships or if breeding takes place within the same social group, but in any case, compies are seldom seen far from members of their own kind. Groups of compies are referred to as flocks, packs, or swarms, usually depending on how they are behaving at the time.

Drinking from a communal water source is a social bonding activity for Compsognathus.

On its own, a compy is certainly capable of surviving, but it really only flourishes in groups. Even a small group of three or four animals gives each individual a better chance of surviving; one member of a flock will alert its fellows to the presence of food or danger using a complex variety of vocalizations and body movements. The compies will swarm over food items and cooperate to mob larger prey, and will scatter if one member spots danger. After they scatter, compies are quick to regroup.

However, the compy is not especially intelligent. Its pack-hunting behavior is often compared to that of theropods such as the Velociraptor, but it is not nearly so complex. Compies engaging in cooperative attacks are not necessarily planning strategy. It is more accurate to describe this as collective mobbing behavior, as the attack proceeds without a clear leader or specific orders given by any one participant. Compy packs do not appear to have a distinct hierarchy at all, with all the flock members appearing equal in status. The closest they come to strategy or hierarchy is the use of one individual to distract a target; it is unknown if this “scout” is chosen by the pack, or if the same individual acts as “scout” every time. It is completely possible that any compy may “scout” a target, initiating an attack from other hungry members of the pack.

Note the red dewlap under the neck. This likely serves a display purpose; at certain times, the male’s dewlap appears bright red.

Although they are not intelligent, compies do appear to have a means of communicating information about threats nearby. During the 1997 incident on Isla Sorna, one compy was struck without provocation by a telescopic shock prod wielded by InGen Harvester Dieter Stark. The following day, Stark threatened a compy with the shock prod; this time, it appeared to recognize the weapon as a danger and fled immediately. While this may have been the same compy, the Harvesters had at that point traveled some distance from the initial encounter. If the second encounter was indeed with a different pack than the first, this suggests that separate social groups of compies can communicate with one another to relay information. If the two encounters were instead with the same flock as it stalked the Harvesters, it instead implies a strong associative memory in Compsognathus, a trait which would help it recall threats it had survived in the past and avoid them.

In Jurassic World: Evolution, the Compsognathus can live on its own, but can also be kept in captivity in groups of up to twenty-five.


Compsognathus reproduction is probably rapid. The male most likely advertises his fertility using his body colors, such as his red dewlap, which becomes enlarged and flushed with color during the courtship season. Compies in courtship color have been observed in late December, but appear to fade back to their normal color by the end of February, indicating a brief mating period during the dry season. Since this is such a small time frame, it is possible there may be several short breeding seasons throughout the year.

Mating is accomplished using cloacae which are located between the hips and tail. As with all dinosaurs, this species lays eggs; theropod eggs are ovoid and birdlike, an evolutionary trait that helps them avoid rolling away from the nest. Compies generally nest in sheltered areas where other animals cannot easily reach them, making reproduction difficult to observe. Their nests were observed by Darius Bowman between December 24, 2015 and January 13, 2016; they are built from grasses and other plants, and the number of eggs laid is surprisingly small: his illustrations show only two eggs in a nest. The eggs are fairly large for the size of the animal that lays them, and are patterned with splotches like those of some ground birds.

The smallest dinosaurs have fairly short incubation periods, measured in weeks; eggs observed by Darius Bowman were laid and hatched within a period of twenty days. This would mean compy eggs laid in the late dry season would hatch before the wet season arrived. It is unknown what kind of parental behavior is exhibited. Most dinosaurs show very strong parental instincts like those of crocodilians.

Stable populations of Compsognathus have existed on Isla Nublar and Isla Sorna throughout the past, but eggs, hatchlings, juveniles, and even subadults have never been witnessed directly. Instead, these populations always seem to consist entirely of adults, even shortly after breeding periods. This suggests that compies grow to skeletal maturity very quickly after hatching, which in turn means that they likely reach sexual maturity after a short time. This is probably what has allowed Compsognathus to flourish.


Compsognathus is a highly vocal dinosaur, making a wide range of birdlike chirps, squeaks, clicks, and whistles. Most of these serve to communicate information to its packmates, but it also uses aggressive hisses and jaw-gaping displays to confront potential enemies. When backed by its hidden packmates, a Compsognathus acts boldly toward threats.

Many people mistakenly assume that lone compies make “friendly” chirping and chittering sounds toward other animals, or otherwise attempt to communicate with members of other species. In reality, a compy is almost never alone, and these noises are meant to distract the target and communicate with the compy’s hidden packmates. Once the pack has begun stalking the prey in the open, they will make high-pitched cries to one another, which appear to serve as a kind of encouragement. The compies embolden one another, increasing the efficiency of their hunt.

Speed and agility are the compy’s main defense against predators should its camouflage fail.

In addition to communicating during hunts, compies will chirp and squeak to one another while traveling or foraging, and often drink communally from ponds and brooks. This likely reinforces social bonds between members of the pack. They will also let out high-pitched whines and squawks when frightened, which alerts other compies nearby to danger. If a whole pack flees from a threat, such as a natural disaster, they are often seen making high leaps in addition to alarm cries. These leaps not only help them cover more ground and clear obstacles, but acts as a form of visual signalling that ensures the pack members can all see one another when fleeing through tall grass or brush.

Ecological Interactions

Because of its small size, Compsognathus is placed low on the food chain regardless of what environment it is in. It is not at the very bottom, however; it still feeds on even smaller creatures, such as lizards and invertebrates. This regulates the populations of various species, including disease-carrying insects such as mosquitoes. Compy packs living in wetlands may eat large numbers of mosquitoes, reducing the populations of these insects and protecting other animals from disease. Of course, compies in the Jurassic period are known to have been affected by blood-drinking parasites such as mosquitoes too; it is unknown if modern mosquitoes affect them similarly. In addition to eating insects, compies will scavenge carrion, dung, and other detritus, which can help to reduce sources of disease in their environment.

While Compsognathus may act cooperatively to bring down prey much larger than itself, this is probably ineffective against well-defended prey items. As a result, there are relatively few larger animals that compies can feed on, restricting their diet. Instead, compies are probably preyed upon by the medium-sized predators in their environment. To survive, they rely on plant life; thick foliage and tall grasses are capable of hiding these striped green animals quite well, so a compy’s life may depend on the health of local flora. With hunters such as Velociraptor and Dilophosaurus living in the same territories, compies must be vigilant, ever ready to run and hide. They make use of their acute senses of vision and smell along with their agility and speed to evade danger.

In the lower left of the image, a flock of compies can be seen hastily grabbing pieces of meat dropped by this tyrannosaur.

Predators abounded on Isla Nublar and Isla Sorna for decades, and Compsognathus would have been threatened by at least some of them. Carnivorous animals known from their territories include dinosaurs such as Herrerasaurus, Teratophoneus, Baryonyx, Allosaurus, Carnotaurus, Spinosaurus, and Tyrannosaurus; while many of these animals were large enough that compies would probably not be viable prey, they could still be a threat. Among the largest of these predators was Tyrannosaurus; compies have been observed fleeing from its movements and become wary when they smell its urine. Compies will also flee from Carnotaurus. Their homes may be disturbed by the behavior or large theropods; a territorial clash between a Spinosaurus and Tyrannosaurus in 2001 was noted to have driven several compies out from their nests. Other carnivores that inhabit the same areas as compies include the pterosaurs Pteranodon and Dimorphodon, as well as modern-day animals including Isla Nublar’s largest native predators the common boa constrictor and brown pelican. The giant alligatoroid Deinosuchus may have inhabited similar territory as well. Compies are known to practice kleptoparasitism, a feeding behavior in which they steal food from other carnivores.

Although the compy normally feeds on small reptiles and insects, it may be able to bring down small mammals and dinosaurs (including birds) if it works in groups. Its habitat included mammals such as brown rats, goats, collared peccaries, and the Nublar tufted deer; birds such as the collared aracari, ducks, and various other species lived on the same islands as it. Reptiles, such as the milk snake and iguana, could potentially be killed and eaten by a few compies working together. Only the smallest of nonavian dinosaurs would have been potential food, with Microceratus being a potential target. Other dinosaurs were simply too large or too armored. Even the relatively defenseless Gallimimus could evade a pack of compies using its speed alone.

Compies shared territory with armored giants such as Stegosaurus, Ankylosaurus, Peloroplities, TriceratopsPachyrhinosaurus, and Sinoceratops, the sauropods Brachiosaurus, Apatosaurus, and Mamenchisaurus, and the hadrosaurs Parasaurolophus, Edmontosaurus, and Corythosaurus. While these animals are vastly larger than a compy’s potential meals, they could benefit in other ways. Compies would be able to eat from the droppings of these huge herbivores, and eat the swarms of insects that dung surely attracted. This would keep the local environment clean and sanitary. Living in the shadows of these titans would also have kept the compies safe from other predators, since the herbivores would keep them away. The pachycephalosaurs Stygimoloch and Pachycephalosaurus, on the other hand, would not be such welcome neighbors; they are small enough to notice and attack a compy, strong enough to be too dangerous to prey on, and notoriously cantankerous.

Curiously, Compsognathus does not show any fear of Troodon pectinodon, and the latter does not appear to prey on compies. In fact, compies often show up after a T. pectinodon kill. This suggests that a symbiotic relationship between the two may exist. Compies might feed on the victims of their larger neighbors, but could also eat the insects that would surely be attracted to the nests. While the nature of their relationship is entirely speculative at this point, it hints at a unique aspect of these animals’ lives that has yet to be fully explored. Compsognathus does not appear to have a similar relationship with Troodon formosus, which has very different biology and behavior.

Relationship to Humans

Above all else, the Compsognathus is famous for its small size; for over one hundred years it was the smallest nonavian dinosaur known to science. Its birdlike appearance has also endeared it to many, including scientists who value it for its clear demonstration of the relationship between present-day birds and extinct dinosaurs. In the Genetic Age, Compsognathus has been consistently popular despite its tiny size compared to other de-extinct species.

It was bred for InGen’s Jurassic Park during the 1980s and 1990s, though it was not successfully put on exhibit. This was one of the species studied in detail by Dr. Laura Sorkin in the early ’90s, and she considered it her favorite due to its similarity to the chickens from her family’s farm. She speculated that it might have originally had feathers; currently, there is no direct paleontological evidence for or against it, since some compsognathids were wholly or partially feathered but some may have lacked feathers.

Humans generally adore the Compsognathus for its cute, birdlike appearance, but this belies an animal that can become aggressive and nippy at a moment’s notice.

Attempts to put this species on exhibit, or otherwise market it to the public, have been mostly unsuccessful despite its popularity. It was not ready for Jurassic Park at the time that plans fell through, and plans to reopen Jurassic Park: San Diego also failed. Had it been successful, Compsognathus would have been the only carnivorous species exhibited; Tyrannosaurus was later considered but this was not the original plan. Jurassic World may have exhibited this species at the time it opened in 2005, but by 2014 this animal was not advertised on any park media or merchandise. It was still absent by the time the park closed in 2015.

Its fate was up for debate between 2015 and 2018, particularly after the 2017 reawakening of Mount Sibo put its survival in jeopardy. The Dinosaur Protection Group aimed to save it along with the remaining de-extinct species, aided by Benjamin Lockwood of the Lockwood Foundation; his financial aide Eli Mills turned the project to his own aims with the help of big-game hunter Ken Wheatley. Compsognathus is hardly “big” game, but its potential worth was still noted, and so a few of these small carnivores were captured by Wheatley to sell on the black market. However, none are confirmed to have been sold before the auction was interrupted by DPG activists. The DPG’s leader, Claire Dearing, had noted from the early days of her career at Jurassic World that the small size of a compy would make it easier to smuggle than most dinosaurs.

The history of human-Compsognathus relations is marred by other incidents as well. Although this is a small animal and a lone individual does not really threaten a human, it can still deliver a painful and mildly venomous nip if it gets into an aggressive mood, which makes handling it difficult. The late 1990s saw at least two more serious incidents involving Compsognathus; in December of 1996, young British citizen Cathy Bowman was seriously wounded by a pack of compies after feeding one on Isla Sorna. She was hospitalized, although she did survive, and her family sued InGen; this was one of the main contributing factors to the firing of John Hammond and the 1997 Isla Sorna incident. During that incident, InGen’s Harvester expedition attempted to capture compies for Jurassic Park: San Diego based on Dr. Robert Burke‘s assumption that they were harmless scavengers. InGen’s equipment specialist for the Harvester operation, Dieter Stark, treated compies with derision during the expedition and was ultimately attacked by them while separated from the Harvesters. He was unable to find his way back to the group and bled to death from his multiple wounds.

While he was not killed directly by compies, Eli Mills’s remains were scavenged by them after his death, suggesting that compies readily feed on human meat.

Dieter Stark is confronted by a Compsognathus, Isla Sorna (11/3/1997)

While Stark remains the only confirmed case of a human dying by Compsognathus attack, the threat still exists, particularly for weaker individuals such as children or the elderly. Animal behaviorist Owen Grady cautioned against compy pack-hunting behavior in the Jurassic World: Fallen Kingdom Survival Guide, suggesting using food to distract a compy pack. However, it is important to note that food should be used only as a distraction; feeding the animals without immediately leaving them behind will only teach them to associate humans with food, leading to potentially disastrous encounters for both animals.

This dinosaur can also be a pest because of its predilection for tearing at electrical wiring. This may cause power outages and other issues.

Today, Compsognathus are known from several locations in North America, suggesting that a breeding population exists. Since their adaptable nature and evasive behaviors make it infeasible to exterminate them completely, the public must now learn how to avoid harmful interactions through proper caution.

Based on Jurassic World: Evolution, the cost for raising a Compsognathus from fertilization to maturity as of 2018 would be $57,000.

Behind the Scenes

The character Dr. Robert Burke, the paleontologist featured in The Lost World: Jurassic Park, misidentifies this species. He refers to it as Compsognathus triassicus (or Procompsognathus triassicus, per the script). This may have been a gag for the film. Dr. Burke shares an uncanny resemblance to real-life paleontologist, Dr. Robert T. Bakker, who paleontological consultant Dr. Jack Horner has a long-standing rivalry with. Dr. Horner describes the character here:

“In TLW you may have noticed a paleontologist in the movie that wore a big straw hat and had a beard…this character was based off a real paleontologist that often disagrees with me … I had him eaten too! (laughs)” — From an interview on Dan’s JP3 Page on April 5th, 2001

The misidentification of Compsognathus in the film may have been a joke on the part of Dr. Horner intending to make the character Dr. Burke (and by extent Dr. Bakker) appear incompetent, but as this would be a relatively obscure joke, it is more likely a blooper. The species Procompsognathus triassicus appears in the novel versions of both the first two films, and members of Universal Studios may simply have confused the two animals. However, the animal was correctly identified as Compsognathus longipes on the InGen IntraNet website, which was created in 1997 at the same time the film was being produced.

Disambiguation Links

Compsognathus longipes (SF-Ride)

Compsognathus “triassicus” (JN)

Compsognathus “triassicus” (CB-Topps)

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Procompsognathus triassicus “pentadactyl” (C/N)

Procompsognathus triassicus (CB-Topps)