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Combine a bulbous snout with a prominent jaw, a body like a beer keg set on four stubby legs, and you have a hippopotamus.

Animal

Depending on pack ice for their habitat, polar bears are threatened by climate change—and by traffic in their fur and parts.

Animal

One of the largest living land mammals, rhinoceroses once shared the earth with saber-toothed cats and the earliest humanlike apes.

Animal