Everyone sits in the circle and picks an animal, a motion and a noise for that animal.
One person "sends" the action to another person by making their own noise/motion, and then someone else's noise/motion. That person, in turn, makes their noise/motion, and then another person's.
For example, in a game with a cat, a dog, and a monkey, the action might be as follows:
Cat Dog
Dog Cat
Cat Monkey
Monkey Dog
Dog Cat
and so forth...
Cat, monkey, and dog are commonly used, but creativity is encouraged...the sillier, the better!
If someone "messes up" (stumbles over their noise, does the wrong combination of noise and motion, or hesitates too long), they're out for that round. Last person still in is the winner.
**Non-competitive version: no one gets out (no matter how much they mess up)--the game continues until everyone gets bored. Animals will get crazier with time!