Dolphins can stay constantly alert for more than two weeks by sleeping with only half of their brains, researchers say. These findings suggest how dolphins can keep on the constant lookout for sharks, ...

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 ...

Dolphins live in almost every ocean, except most tend to avoid the cold waters in the Arctic and around Antarctica. Some also live in rivers, including the Amazon River in South America and the Ganges ...