Squirrels, members of the Sciuridae family, possess several unique biological adaptations. Their front incisors grow continuously throughout their lives, requiring them to gnaw constantly to maintain a manageable length. A key anatomical feature is their highly flexible hind ankles, which can rotate 180 degrees, allowing them to grip bark and climb down trees head-first. These acrobatic mammals can also survive falls from over 100 feet by splaying their limbs and using their bushy tails as parachutes to slow their terminal velocity.

Beyond their physical traits, squirrels play a vital role in forest regeneration. Through "scatter hoarding," they bury thousands of nuts across their territory. The nuts they inevitably forget sprout into new trees, such as oaks and hickories. Their behavior also reveals high intelligence. A squirrel's zigzag run is not panic but a deliberate tactic to evade predators, a defense aided by their nearly 360-degree vision.

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