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How can tree squirrels climb down a tree headfirst?

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Do squirrels forget where they hide their food? — squirrel Overview of food-burying behaviour in squirrels.

Tree squirrels are able to descend trees headfirst because of their specialized anatomy, specifically their flexible ankle joints. These joints can be rotated, allowing the squirrels to splay their hind feet flat against the tree trunk while moving downward.1

This physical adaptation, combined with their large, sharp, and curved claws, enables them to maintain a secure grip on vertical surfaces. By keeping their hind feet anchored in this splayed position, they can navigate downward with their head leading, a movement pattern that is distinct from other climbers that must descend backward.12