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, ...

Killer whales and dolphins have been working together to hunt salmon in the northern Pacific Ocean, an unexpected finding that further reveals the complex social lives of marine mammals. Video cameras ...

Off the coast of British Columbia, dolphins lead killer whales to salmon and earn their share of lunch, a new study reveals. A new study is the first to document cooperative hunting between orcas and ...