The Canadian government is redoubling its efforts to protect a critically endangered population of Southern Resident killer ...

Like a proud cat leaving a bird on its owner's doorstep, orcas—also called killer whales—may sometimes offer to share their ...

Dubbed "allokelping," it might be a unique cultural phenomenon that's as endangered as the orca population itself ...

Killer whales have been caught using seaweed to rub and groom each other in what scientists say is the first evidence of marine mammals making their own tools.

The encounter, observed by snorkelers in Norway, “involved repeated episodes of gentle, face-to-face oral contact.” ...