What’s Causing California’s Bright Pink Sea Slug Bloom?

By Laura Clark

Tide pools along the coast of central and northern California are filling up with inch-long, pink Hopkins’ rose nudibranch—a sea slug whose vivid coloring gives it a kind of punk rock appeal.

Scientists are logging dozens of the creatures per square meter, says the University of California, Santa Cruz.

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"Okenia rosacea (Hopkinsia rosacea) Hopkins Rose (7541139858)" by Jerry Kirkhart from Los Osos, Calif. - Okenia rosacea (Hopkinsia rosacea) Hopkins RoseUploaded by Magnus Manske. Licensed under CC BY 2.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Okenia_rosacea_(Hopkinsia_rosacea)_Hopkins_Rose_(7541139858).jpg#mediaviewer/File:Okenia_rosacea_(Hopkinsia_rosacea)_Hopkins_Rose_(7541139858).jpg

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