Ever wondered what was the very first animal on planet Earth? Perhaps you’d like to discover 10 of the most terrifying prehistoric creatures that weren’t dinosaurs? Or maybe you’re curious about what kinds of deep sea creatures are lurking so far below the surface that we may never find them all? Interested to know just what the heck a blue glaucus or an okapi is?
We’ve got the answers — and the astounding photos and videos to match — in this look at the most interesting animals that our world has to offer.