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
Among those animals, what are mammals? platypus, Greenland shark, puffer fish, rattlesnake, orca, kangaroo, ostrich


assistant
From above, those are mammals: platypus, orca, kangaroo. Greenland shark and puffer fish are fishes, not mammals. Rattlesnake is a reptile. Ostrich is a bird. Note though orca lives in the sea and looks like big fishes, e.g. sharks, orca is in fact a mammal.