Compsognathus

Compsognathus ("elegant jaw") was a small european dinosaur, once thought to be a swimmer. It is mainly portrayed as a pack hunter, after the movie The Lost World: Jurassic Park portrayed them that way.

Iberomesornis's Idea
Compsognathus's live food would be composed of small insects and lizards. Compsognathus would be solitary, running away at anything larger than itself. Compsognathus would live in the shore, where insects would be abundant, and would only be near another Compsognathus if its mate; if not, the Compsognathus from that territory would drive it away.