Keiko was the 15-year-old orca that played Willy in the movie. He became the first captive orca ever to return to the wild.

One of the whales was seen grabbing a bird — a grebe — before pulling it underwater, prompting gasps from the crowd.

Gliding stealthily through Norway’s frigid Arctic waters ... shoulders with one of the most fearsome sea predators — killer whales. Gliding stealthily through Norway’s frigid Arctic waters ...

More than 150 false killer whales were stranded on a Tasmanian beach ... Archaeologists are finding mysterious ancient objects on Norway's melting glaciers. Take a look. House Democrat Sylvester ...

This story appears in the July 2015 issue of National Geographic magazine. There are no orcas to speak of in Western literature. Although they look like mythic creatures, with their sleek bodies ...

An international team of marine biologists have published research in Molecular Ecology that shows the benefits of gene flow ...