Spanish shawl nudibranch on kelp off Santa Catalina Island, Channel Islands, California, USA
© WaterFrame/Alam
One stylish slug
Today we're meeting one of a motley group of sea slugs called the nudibranchs (rhymes with 'thanks'), known for their unique, often complex shapes and neon-bright colours that help discourage predators. The Spanish shawl's fire-orange mane is made up of tendrils called cerata that mainly act as gills. But that mane also retains venom from the slug's prey - sea anemones - treating any would-be devourers to a painful sting. Should a ravenous sea star disregard these defences and get too close for comfort, the Spanish shawl has a Plan B: By flapping its whole 12- to 17-centimetre body like a gelatinous wing, the nudibranch can flutter into open water for a quick escape.
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