As many have guessed from the massive animal's size, this new yacht owner is a male sea lion. Males typically have a large crest on the top of their heads, whereas females have a typical round head.

In this clever nature showdown, seals and sea lions face off in a role-playing game-style battle. Learn how evolution shaped their unique abilities, from the seal’s stealth and streamlining to the sea ...

Dr. Alissa Deming, left, and veterinarian assistant Malena Berndt give anti-seizure medicine to a California sea lion named Patsy in a recovery room at the Pacific Marine Mammal Center in Laguna Beach ...

Stephanie Nehasil collects sea lion scat samples in the field at San Nicolas Island. The research study was prompted by ...

Sea lions are the clowns of the ocean, often compared with dogs, our loveable companions. They have a similar face and ...