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

Newborn pilot whales have been spotted mysteriously swimming among pods of orcas. Scientists are trying to puzzle out how the pilot whale calves got there and what happened to them.

It's the most recorded whale deaths in the region since 2019. Nearly two dozen whales have died in the San Francisco Bay Area in recent months, according to animal rescue groups. A total of 19 gray ...