Birds have impressive balancing skills. Learn how birds stand on one leg and stay upright even while they're sleeping.

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If you've ever seen a bird sleep, you might have noticed that they do it standing on one leg. They also fluff their feathers up, almost like they are creating their own little blanket. It's really ...

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How long a person can stand -- on one leg -- is a more telltale measure of aging than changes in strength or gait, according to new research. How long a person can stand -- on one leg -- is a more ...