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Gecko foot anatomy showing branched setae under magnification.  This microscopic branching is what makes gecko feet so sticky.  Illustration from “30 Animals that made us smarter” by Patrick Aryee (BBC Books).

Blue mussels Mytilus edulis with byssal threads on wooden piling.  Illustration includes barnacles and limpets, and some bladder wrack seaweed.  Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books).