African lions are stunning and iconic creatures in danger of extinction.

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

Named for their stubby tails, bobcats are so elusive that you’d be lucky to catch a glimpse of one in your lifetime.

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