Killer whales were seen ‘kissing’ for the first time in the wild, photo evidence shows. The ‘rare’ encounter ‘lasted nearly two minutes,’ researchers said.

Researchers have observed a population of orcas that cut and position kelp tools between their bodies to scrub each other’s backs.

A discovery of unique killer whale behavior may be the first documented time a marine species has been seen using and creating tools for something not food-related.

Rare "Moonwalking" Killer Whale Behavior Hides Much More Gory Truth Spoilers, but they aren't actually dancing.

(Reuters) -Killer whales are known for exceptional intelligence, displaying complex social structures and sophisticated communication. New research provides fresh evidence for this, documenting ...

Orcas were spotted using kelp as a grooming tool on each other, the first known use of tools among cetaceans for something other than hunting prey.

Researchers using a new drone say they have observed killer whales finding and modifying stalks of kelp to preen each other.

The whales in question are the southern resident killer whales that live in the Salish Sea between Vancouver Island and Seattle.