When you think of great swimmers, animals like dolphins, fish, or penguins probably come to mind. But the animal kingdom is full of surprises, and many creatures you’d never expect to navigate well ...

Earlier this month, homeowners in Boca Raton, Florida, were shocked to find a river otter swimming in their backyard pool. As adorable as the animal was, the homeowners were concerned for his health, ...

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 ...