An orca's final moments may have been captured on film for the first time, after repeated attempts by two young orcas to keep the old, dying male at the surface so he could breathe.
Dolphins in Koombana Bay, Western Australia, have learned how to raid crab pots being used for bait and remove the hooks, footage has revealed.
For the fourth time in two years, a group of unusually brazen orcas in southwestern Europe have sunk a sailing boat after relentlessly attacking it for almost an hour on Halloween.
A megapod of dolphins with thousands of individuals has been captured on video hunting flying fish off the coast of Costa Rica.
Orcas have their own dialect, greeting ceremonies and even wore salmon as hats in a weird fad during the 1980s.
From sinking boats and feasting on shark livers to dining on whale tongue and tossing porpoises around for fun, orcas are displaying some fascinating — and sometimes terrifying — behaviors.
Researchers used DNA analysis and traditional knowledge to learn about an orca named Old Tom and his family's remarkable relationship with humans.
The severely decayed remains of a marine creature recently washed up on a beach in Papua New Guinea. Experts can't agree on what the ghostly white lump is, but it is most likely the remains of a marine mammal.
Three mass mortality events have struck a population of gray whales off the west coast of North America since the 1980s, and scientists have linked them to changing conditions in the Arctic.
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