Hippopotamus' are vulnerable(becoming endangered and they're large mammals that live in water.
Almost all whales are endangered .
The Polar Bear
the blue whale
The Blue Whale is the largest mammal and also one of the most endangered.
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.
a duck bill platypus
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 Blue Whale
whale
Blue Whale
Almost all varieties of whale are being hunted to extinction by the Japanese, often under disguises such as 'research'.
Whale