Suppose there's a sparrow on a tree, the weather is very cold. The sparrow has been sitting on the tree for 20 minutes, suddenly it flies away. Why?
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Because of the cold wind???
sanasindwani:
Actually I don't even know the answer. I just have to complete my bet of answering all tricky questions..... So I post it to find an answer basically
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Winter is a challenging time for backyard birds such as cardinals, woodpeckers, nuthatches, chickadees, titmice and wrens.
But roosting in tree cavities, bird boxes and an assortment of makeshift shelters can help these birds stay warmer at night and give them an energetic edge.
Finding a snug place to sleep on a cold winter’s night is particularly important to Carolina wrens. They belong to a primarily tropical genus of wrens and seem to have limited capacity to deal with really cold weather and snow..... may be this is the answer
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