In recent weeks, hundreds of sea lions, dolphins and other animals have turned up in the sand dead or seriously ill, alarming rescuers and beachgoers alike.

Driven mad by toxic chemicals released by algae flourishing in warming oceans, sea lions and other marine mammals are becoming aggressive.

A common neurotoxin produced by algae blooms is making California sea lions more aggressive. Here’s why it has the power to change behavior—and the danger it poses.

A 36-foot emaciated sea creature washed up on a California beach, and now researchers want to know how it died. On March 29, the Marine Mammal Center was notified by the National Park Service staff that a dead gray whale was found on Alcatraz Island, according to an April 1 news release by the Marine Mammal Center.

It's currently unclear if the creatures died from toxins, disease, human influence, or climate-related stress.

Toxic algae off the coast of Southern California is killing or sickening hundreds of sea lions, dolphins and seabirds, while forcing rescuers to make tough choices about "which animals to save."

A marine mammal nonprofit has assessed more than 200 sea lions and 10 dolphins apparently sickened with domoic acid poisoning since Feb. 19 A routine surf session for RJ LaMendola Friday morning in Oxnard Shores turned into a harrowing ordeal between the ...

The early bloom of toxic algae off the coast of California is causing mass poisonings of sea lions, with animal rescue organizations receiving up to 100 reports a day. "We are having to do triage on the beach as we try to identify those animals where we have the greatest chance of making a difference,