Dolphins

The nine Type D orcas were found on a beach in Chile, with a necropsy of one female showing it was a healthy adult, with no signs of human involvement in its death.

As the crew motored inshore after the encounter, one of the orcas reappeared, chased the boat into the marina and tore off what little fiberglass was left on the two rudders.

Previous reported interactions between orcas and sailboats followed a clear pattern, with the animals losing interest and swimming away once they had broken the rudder.

Scientists think a traumatized orca initiated the assault on boats after a "critical moment of agony" and that the behavior is spreading among the population through social learning.

The mostly white orca calf was spotted by a whale-watching vessel. It most likely has a pigment-related condition called leucism, experts say.

The all-white bottlenose calf, which was swimming with around 200 other dolphins, was spotted by a lucky couple on their wedding day.

Inbreeding among an endangered population of orcas off the coasts of British Columbia, Washington and Oregon is a cause for concern.

A pair of orcas off the coast of South Africa have been ripping open sharks and feasting on their livers for the last eight years. A great white shark that survived an attack by the serial killer brothers has now been identified through huge scars across its massive body.

An orca killing spree continues in South Africa. Their target: shark livers.

Researchers have recorded an orca swimming with a pilot whale calf in a possible interspecies adoption, but how the two came together is a mystery.