An opalescent nudibranch (sea slug) crawls on an invertebrate-crusted rock. Its body is milky white with bunches of long, orange-tipped cerata on its back.

It’s Sea Slug Day!

Send nudibranchs! Or sea hares or headshields or sap-suckers or side-gills or sea butterflies—whatever the slug, it’s time to share the love!

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