Mammals can maintain a constant body temperature.

This lake is inhabited by a wide variety of aquatic organisms.

He owns a big house.

I found a beautiful sea slug at the bottom of the sea.

A sea cow is a very large aquatic mammal.

I was amazed at his extraordinary talent.

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It is a very beautiful view.

He treats us as a big friend.

The Steller's sea cow was a large marine mammal that once lived in the North Pacific.