Compsognathus is the smallest dinosaur in the series. It usually poses no threat to humans. Like certain birds, it has an obsession with stealing small, shiny items.
Compsognathus played a very minor role in the games. In Dino Crisis, it is encountered twice in large groups. The first encounter is in the Medical Room Hallway where they are found eating a dead Velociraptor. The second encounter is in the corridor that has the elevator Rick needs to repair to get to Floor B3. If the player approaches them, they will then jump at and bite the player. They don't hurt the player that much at all but they are very annoying. They can usually be taken out with one handgun bullet if the player so chooses to shoot them.
Compsognathus often will run out of open ventilation ducts in these parts of the game. It is unknown if the researcher in the room within the corridor and the Raptor in the Medical Room were killed by the Compsognathus. They may have been scavenging as they are often thought to have been opportunists.
In Dino Crisis 2, its only notable role was when it stole an important item from the player and the player had to trap it in a room, one of the game's simplest yet most annoying puzzles. The Compsognathus played no role in Dino Stalker other than as wildlife ambience and has no harm or even attacking the player.
Dino Crisis 2: Extra CrisisEdit
If the player beats Dino Crisis 2 on hard mode the Compsognathus is unlocked along with the Triceratops and both can be purchased with Extinction points. The Compsognathus can cause large amounts of damage in both modes of Extra Crisis. However, it can be killed in one hit by the enemy. Thus, it mainly serves as a joke character in Extra Crisis. Its alternate color for Player 2 in Dino Duel appears to be a homeage to The Lost World: Jurassic Park's Compy.