During Alan Grant‘s dig, he was asked by one of the graduate students why the Velociraptor infant they were excavating had died. He explained that in the wild mortality is high, being at seventy percent for carnivores. He also said that it could’ve been any number of reasons, disease, separation from the group, or even an attack by an adult. Grant utilized the example of an African Lion taking over a new pride, killing the infants in order to induce the females into heat.
Jurassic Park by Michael Crichton page 57-58 (First Edition, Thirty Fourth printing)