Scientists have spotted orcas hunting a nursery of juvenile sharks for the first time, flipping them upside down and feeding on their energy-rich livers, a discovery that hints at changing seasonal diets of killer whales.

Animal rights advocates have warned that 'time is running out' for orcas Wikie and Keijo, who remain trapped at France's now-defunct Marineland of Antibes.

SEATTLE — The endangered killer whales of the Pacific Northwest live very different lives from orcas in captivity. They swim up to 100 miles (161 kilometers) a day in pursuit of salmon, instead of being fed a steady diet of baitfish and multivitamins.

The Center for Whale Research’s latest census shows just 74 of the orcas remain. They need more food, space and less pollution to grow their numbers.

A group of humpbacks tried to stop orcas from hunting a sea lion off the coast of California, boaters said. Morgan Quimby Monterey Bay Whale Watch Humpback whales were spotted trying to stop orcas from hunting off the coast of California in a “rare ...