A tiger walks the same worn groove along the edge of its exhibit like a broken record. A parrot methodically plucks out its ...

Five new animal species that camouflage themselves as excrement or bark reveal some of what still remains hidden in the world ...

With copper-blue blood prized by modern medicine and a body plan older than dinosaurs, the horseshoe crab reveals how ancient ...

Animals have evolved to sleep in extreme ways — for example, taking micro naps during parenting, sleeping on the wing during ...