Sharks do not sleep the same way humans or most animals do. Some species must keep swimming to push water over their gills, while others can rest on the ocean floor. Scientists have discovered that ...

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 ...

Ever wondered how some animals manage to survive without the luxury of a good night's rest while we humans desperately need our eight hours? The animal kingdom is packed with creatures that seem to ...

Researchers at the University of Miami recently published research results involving the first-ever measurements of melatonin in wild sharks. The data highlights the impact of bright coastal ...