Here's what happens: The plankton eat algae that contains the acid, and then the fish eat the plankton, and the sea lions eat the fish — one thing surviving off another, passing on the toxic acid.

PORTLAND - The competition between protected sea lions gobbling Columbia River salmon and impatient humans with empty fishing lines has led to vigilante action. A fisherman shot a sea lion who stole a ...

OREGON CITY, Ore. - Not only are sea lions feasting on endangered salmon in the Columbia River, now they're gorging on them along the Willamette River, too. It's getting so bad, sport fishermen said ...

A sea lion found malnourished with a bullet embedded in its head in Southern California in August is recovering well after undergoing surgery to remove one of its eyes, animal care officials announced ...

A troubling situation is unfolding along the San Diego coastline as a dangerous algae bloom leads to an alarming rise in sea lions falling seriously ill. The bloom has caused a significant increase in ...

Sea Lions in the Cowliz River, near the mouth of the Cowlitz and the Columbia rivers in southwestern Washington. (Photo by GarysFRP/Getty Images) The federal permit that allows Northwest states and ...