Brief overview of the effect of domoic acid, a "naturally-occurring neurotoxin ... [which] has been responsible for the deaths of hundreds of sea lions in southern California during the last few years. Domoic acid is a chemical that is produced by algae or plankton when it blooms. Domoic acid was not discovered until the late 1980s." Includes links to marine mammal care centers in Southern California. From the Surfrider Foundation, a nonprofit environmental organization.