Researchers identified two ecologically distinct communities of transient killer whales along the West Coast, each with unique hunting behaviors, habitats, and social networks.

A study comparing the nutritional demands of killer whales with the caloric content of their prey has startling implications for the potential impact of these large predators on populations of other ...

Inner coast transient killer whale hunting close to a Steller sea lion haulout off the outer coast of Washington. New research has confirmed that West Coast transient killer whales who live between ...

BELLINGHAM, WA -- An Oregon community is bringing in some unusual help to try to fix their sea lion problem. They're hoping a fake killer whale from Bellingham, Washington, will do the trick. KING-TV ...

Orcas have long been revered for their intelligence, adaptability, and group-hunting strategies. But one scientific review spanning two decades has revealed a little-known, yet intriguing behavior.

PORTLAND, Ore. (AP) — An effort to use a fake, life-sized orca to scare off hundreds of sea lions crowding docks off the Oregon coast ended, at least temporarily, Thursday night with the fiberglass ...

A new orca calf has been born in the Pacific Northwest, and this baby boasts an impressive family tree. The orca calf belongs to a family of transient killer whales, or “Bigg’s” killer whales, and was ...