The Compsognathus are vulnerable to other small predators - cause just like the Velociraptor, Deinonychus, Dilophosaurus, Herrerasaurus, Proceratosaurus and Troodon can hunt and swallow the whole Compy.
All the Small/Medium herbivores are safe with the Compsognathus (cause their small) and they don't panick and they all can live along with the Compys
They are vulnerable to all predators except for the Compsognathus.