Jon Chamberlain - Researcher in Computer Science and Marine Biology

Jon Chamberlain - Researcher in Computer Science and Marine Biology

Picture of a pyjama nudibranch

Pyjama Nudibranch

This brightly coloured sea slug called a Pyjama nudibranch (Chromodoris quadricolor) was spotted on a dive at Ras Ghazlani, Egypt.

Warning colouration

Nudibranchs come in a huge array of colours and patterns, sometimes for use as camouflage, and other times (as is the case for the pyjama nudibranch) used as a warning to potential predators. Over time predators become aware that the brightly coloured sea slugs are unpalatable and don't attack them.

Other species use mimicry as a defense, where they evolve to look like a brightly coloured, but inedible sea slug, and hence get the same benefits, despite not being poisonous themselves.
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