New research confirms two distinct groups of West Coast killer whales with different diets, habitats, and behaviors.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. It was an orca ...

In six years studying orcas off Chile’s coast, marine biologist Ana García-Cegarra had never witnessed anything like what she saw in May 2023. In the vast Pacific waters near Antofagasta, a killer ...

Preface -- What is a marine mammal? -- Main groups of marine mammals -- Modern taxonomy of marine mammals -- How to look for marine mammals -- Natural history of marine mammals -- Conservation -- How ...

Killer whales have a grisly new technique for hunting juvenile great white sharks – and scientists caught it on camera.

157 killer whales are stranded on a remote beach in the Australian state of Tasmania. Although most of them are still alive, rescuing the surviving animals is very difficult due to their remote ...

When flipped upside-down, the sharks fall into an involuntary trance, leaving them easy victims for the orcas. Why the sharks freeze like this is a mystery.

New research has confirmed that West Coast transient killer whales who live between British Columbia and California are two ...

Animal rights advocates have warned that 'time is running out' for orcas Wikie and Keijo, who remain trapped at France's now-defunct Marineland of Antibes.