The species Orcinus orca, generally known as orcas or killer whales, is made up of many genetically distinct populations ...

Killer whales may all look alike, but molecular biology indicates there are at least three distinct species of orca and maybe five or more, researchers reported Thursday in the journal Genome Research ...

Learn how differences in diet and behavior split orcas off northern Japan into resident and transient groups — and what their ...

Killer whales are the only natural predator of baleen whales — those that have “baleen” in their mouths to sieve their plankton diet from the water. More solitary than toothed whales, baleen whales ...

Orcas have long been revered for their intelligence, adaptability, and group-hunting strategies. But one scientific review spanning two decades has revealed a little-known, yet intriguing behavior.

Whatever may be the driving force, killer whales’ use of tools is a remarkable discovery, especially when few animal species ...