Biologists headed to the San Mateo County coast Wednesday morning to try and determine what killed an endangered sperm whale.
The U.S. Navy is seeking permits to expand sonar and other training exercises off the Pacific Coast, a proposal raising concerns from animal advocates.
A baby sea lion is making a recovery in the Bay Area thanks to an unusual Coast Guard rescue.
New research suggests there are as many blue whales living off the coast of California as there were before humans started hunting them to near extinction 110 years ago.
Boaters on Monterey Bay are being warned to keep their distance from humpback whales and other marine wildlife feeding on shore, according to the Monterey Bay National Marine Sanctuary.
Parts of Point Reyes National Seashore will be closed for four months to protect seals and their newborn pups.
A rehabilitated California sea lion was given a Christmas Eve send-off when he was released back to the ocean Monday in Marin County, a Marine Mammal Center spokesman said.
Two wayward dolphins discovered in an industrial canal in South San Francisco appear to have returned to San Francisco Bay.
Federal maritime officials have approved a plan to protect whales in and around San Francisco Bay after seeing an uptick in the number of collisions between the marine mammals and large ships.