Various boids are in the game. Boids are clusters of wildlife intended to add to the scenery.
The following boids can be found in Crysis:
They act passively of their own accord and do not interact with the player. The player can pick them up. If the player presses the use or fire keys the animal will be thrown, killing it but also making it a viable projectile. Right clicking while holding an animal will drop it without killing it, and it will go about its animation. Turtles however, can survive under normal circumstances, though they may hide in their shell for a while. You will encounter the shark when you swim out in the sea. The shark will then try to eat you.
Turtles do not have any physics, thus when thrown they will fly endlessly.