In honor of Shark Week, we’re going to take a look at shark’s evolutionary cousins, “batoids,” more commonly known as rays. Rays split from the ancestors of modern sharks around 200 million years ago, during the late-Jurassic period. Manta rays, much like many species of shark, need to keep moving in order to breathe. If that’s scary, put into perspective that humans intentionally kill up to 73 million sharks per year, with up to another 70 million being killed as accidental bycatching during fishing operations. Only three species of shark are known for committing unprovoked attacks on humans: the great white, the tiger shark and bull shark.