Friday Fact
Why don't birds fall out of trees when they're sleeping? When birds "sit" on branches, tendons in the legs pull their claws into closed position and lock the birds onto their perch. When awake, the bird "stands," unlocking the tendons to prepare to take off.
From: Nature, a day at a time by Cathie Katz
From: Nature, a day at a time by Cathie Katz
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