Phyllidia coelestis, a sea slug
© Jurgen Freund/Aurora Photos
Phyllidia coelestis, a sea slug
This sea slug, usually less than 2.5 inches long, crawls along the sea floor of the Pacific and Indian Oceans at depths of nearly 100 feet. The strange colour and markings have a purpose: It’s a warning to predators. Aposematic colouring, as this is called, usually indicates that an animal is either poisonous or doesn’t taste good. It’s an easy way to avoid becoming prey. Honestly, we aren’t hungry. We just like that this sea slug’s markings make it look like a rubber monster mask, cast off after a long night of Halloween fun.
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