15 Facts You Didn’t Know About Sharks

The earliest recorded fossil records of sharks date back to 420 million years ago. This means that sharks were terrorizing the waters for hundreds of millions of years concurrently with dinosaurs.Like sharks, rays have cartilaginous skeletons, five to seven gills, and dorsal fins. Rays distinguish themselves with generally flattened bodies and enlarged pectoral fins. They both fall under the subclass Elasmobranchii but rays are in their own separate order called Batoidea.