system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Group these animals into 2-legged and 4-legged categories:  kangaroo, dog, rhino, lion, giraffe, penguin, chimpanzee and cat.


assistant
Penguin, chimpanzee and kangaroo have 2 legs. Dog, cat, lion, rhino and giraffe have 4 legs.