In two incidents documented in Mexico’s Gulf of California, orcas worked together to blast sunfish into smithereens after they had killed the enormous animals ...

Orcas can have brains up to five times heavier than human brains, but scientists say brain size alone is a poor measure of intelligence. Their flexible behavior ...

"Don't play with your food" is a rule orcas don't seem to follow. Off the shores of Cabo San Lucas, Kathryn Ayres, a scientist at the ocean-health nonprofit Beneath The Waves, saw a surprising orca ...

Great white sharks are among the ocean’s most formidable predators, yet researchers have documented that they will abandon ...

Scientists captured video of orcas ramming into sunfish with such force that the fish exploded. The behavior may be for fun as well as for feeding, they report.

Some orcas hurl their massive bodies onto the shore to snatch sea lion pups from the beach, a calculated gamble that can go fatally wrong if the timing is even slightly off.

SEATTLE — Wild orcas on more than 30 occasions in four oceans have attempted to share their prey with people, potentially to develop relationships with humans, researchers have found. In each of the ...

The Orca Behavior Institute recorded a record-breaking number of Bigg’s killer whale sightings in the Salish Sea in July.