Add Yahoo as a preferred source to see more of our stories on Google. Video taken by divers showed a false killer whale twirling right in front of them in Costa Rica. Research biologist Robin Baird ...

An orca pod in the Pacific Ocean off the coast of Mexico has devised a cunning strategy to hunt and kill whale sharks — the world’s largest fish that can grow up to 18 meters (60 feet) in length — new ...

Marine biologists have documented a remarkable hunting strategy employed by killer whales in the southern Gulf of California, in which they harvest whale sharks' organs. Researchers in Mexico have ...

Learn about the fatal encounters between two groups of killer whales, bringing the idea of whale cannibalism into question.

Two severed fins bearing the tooth marks of other killer whales have raised a troubling question: are some orcas hunting ...

This story was supported by grants from the Pulitzer Center and the Alaska Center for Excellence in Journalism, in partnership with The Seattle Times and Northern Journal. Second of three parts.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An orca pod in the ...