为什么鸟儿站在树上睡觉不会掉下来呢？这与鸟类特殊的腿部结构有关。鸟类蹲下时，它会拉伸与脚趾相连的肌腱，带动脚趾合拢。所以鸟儿在睡觉时， 它的爪子会毫不费力地弯曲并紧紧抓住树枝，直到腿部伸直，爪子才会松开。

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