the blue whale
Almost all whales are endangered .
Hippopotamus' are vulnerable(becoming endangered and they're large mammals that live in water.
The Polar Bear
The Blue Whale is the largest mammal and also one of the most endangered.
Almost all varieties of whale are being hunted to extinction by the Japanese, often under disguises such as 'research'.
Whales, notably the blue whale, are endangered, mainly because they are hunted by man at a rate that their relatively small populations cannot compensate for.
sea lions
a dolphin is a marine mammal that lives in open water in the ocean.
Some species of whales (large marine mammals) are most threatened with extinction. The major causes are hunting by humans, damage to their habitats, and a low reproductive rate.
A mammal can live on land and in the water, or sea.
A manatee is an aquatic mammal, meaning a mammal that lives in water. It is not a fish nor a bird.
By not polluting water the dophin lives in.