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The kelp urchin (Holopneustes purpurescens), lives in ‘nests’ in the kelp which it makes by pulling the kelp fronds around its body using its tube feet. The nests provide protection from predators for the urchins, and also provide shelter for the herbivorous snail Phasianotrochus eximius. Waubs Bay, Bicheno, Tasmania.

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