Aquatic
I think what you are asking for is amphibian. An animal capable of living both on land and in water.
biotic
WHAT DO CALL AN ANIMAL THAT LIVES ONLY IN WATER?A ANIWATER
They generally call animals that live only in water fish, but there is certain categories that they can go under. For instance, some fish are actually mammals.
Amphibians
yes .
It depends; there are two species of hippo, and one of them, the pygmy hippo, is indeed a jungle animal. The common hippo, though, is more of a savannah animal. Both species spend most of their time in the water though, so maybe you could call them river animals instead!
You can call it anything you want!
amphibians
A scaredy cat
He has to call a professional.
Amphibian