Compognathus is a tiny nimble carnivore native to Europe during the Jurassic period. Often referred to as "Compies," they are elegantly built, with a long tail and pointy snout. This sleek theropod has two clawed fingers with a tiny third digit.

InGen's Compsognathus is a light green with darker green stripes along the entirety of its body. The underside of this carnivore is a tan coloration with red undertones, particularly on its throat. Its muzzle fades into a dark brown tip, and its proportionally large eyes are a dark red.

Compies are infamous for their distinctive group behavior. Exceptional jumpers, they are known to swarm prey significantly larger than themselves in great numbers. Part of their ability to do so stems from their venomous bites which result in a tranquilizing effect. This narcotic venom is believed to be a primitive neurotoxin, though is only present in trace amounts. While there is no known social order within Compsognathus groups, they are rather intelligent creatures as they are capable of recognizing and distinguishing humans who pose a threat to them.

Although capable of preying on larger animals, Compies are generally scavengers. Consuming whatever they can bite, these carnivores are not picky eaters. They typically hop on two feet like a bird and make avian chittering sounds. Compies are attracted to shiny objects and tend to nest at higher elevations, such as the rafters of buildings.