After scanning the interior of a Velociraptor skull, a rapid prototyping machine read the data as thousands of slices of information and placed them side by side in order to sculpt the resonating chamber. When air passed through the chamber, it replicated the sounds that would have been used while the animal was alive. Storing the resonating chamber in Billy Brennan’s camera bag, Dr. Alan Grant later used against the Raptors on Isla Sorna after their stolen eggs were returned. The resulting sounds confused the dinosaurs, and they exited with their eggs after hearing the approaching United States military helicopters.
The presence of the resonating chamber is also a useful tool to identifying the species of Raptor that InGen cloned. InGen’s Raptors could conclusively be identified as Deinonychus antirrhopus by a single feature: the resonating chamber. Dr. Grant in 2001 was excavating a “Velociraptor” in Montana which possessed the same sort of vocal feature as present in the live animals he later encounters in the flesh, and is even capable of using a cast of this feature to create sounds that the Raptors recognized. In the mid-late 80’s when InGen first began cloning their dinosaurs, paleontographer Gregory S. Paul had tried reclassifying Deinonychus antirrhopus as well as other taxa such as Dromeaosaurus and the then yet to be described Achillobator giganticus all under the genus of “Velociraptor“. Gregory Paul was known for his nomenclatural “clumping”, or the taking of species that may or may not be related to each other evolutionarily and placing them all under the same genus. Paul did this with Sauronitholestes langstoni, Velociraptor mongoliensis, the scant remains that would later be attributed to Achillobator giganticus, and Deinonychus antirrhopus, clumping them all under the genus “Velociraptor“, when all three have little to directly do with the others evolutionarily. Sauronitholestes is from Late-Cretaceous Alberta, Velociraptor is from Late-Cretaceous Mongolia/China same with Achillobator, and Deinonychus is from Middle-Cretaceous Montana/Wyoming. That last one is the same location where Dr. Grant is excavating his Raptors, and because it is not known whether or not any other species of dromaeosaur in the fossil record possesses a resonating chamber like that of Dr. Grant’s Raptor and the InGen Raptors, it must be assumed that these two animals are of the same species.