It’s pretty rare, but just like us mammals, some flies actually give live birth. One of them is a parasitic fly species Ormia ...

Killer whales are one of the most intelligent animals; only humans have a larger brain relative to their body size, according ...

The apex predators have offered up fish, birds, turtles and whales to humans around the world, according to the study.

Researchers have documented orcas dropping prey and other marine life in front of humans, as if offering us food. The orcas' ...

Southern resident killer whales in the Salish Sea off the U.S. state of Washington have been observed making tools from bull kelp stalks, biting off pieces and using them to massage each other in ...

Their predators include large sharks and orcas (orcinus orca), and these pint-size whales are also threatened by entanglement, vessel strikes, and pollution.

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

Footage captures a pair of orcas nibbling each other's tongues in the Kvænangen fjords in northern Norway. Scientists think ...

In a new sign of toolmaking in marine mammals, orcas in the Pacific Northwest were recorded rubbing stalks of kelp against ...