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Why do tree squirrels have flexible ankle joints?

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

Tree squirrels have flexible ankle joints that can be rotated, which allows them to descend trees rapidly headfirst while keeping their hind feet splayed flat against the trunk. This anatomical adaptation is essential for their arboreal lifestyle, enabling them to navigate vertical surfaces and slim branches effectively.1