1. Introducing sharks, skates, rays, and chimaeras -- What are sharks and how are they classified -- How many kinds of sharks are there -- How did sharks get their name -- Where do shards live -- When ...

Some sharks do need to keep swimming to stay alive, but not all. Like other fish, sharks extract oxygen by passing water over their gills, says Ellen Husain. Many of the larger, faster species use ram ...

Sharks have a branding problem. For many people, the word alone conjures images of horror: sleek predators stalking through ...