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White-tailed deer have white undersides on their tail so when they are alarmed or in danger their tail is held up as they run. The white patch on the tail signals other deer like a flag that there is danger in that area. When a large herd of deer move during the day they will be in sight of each other, yet spread out. As night falls the deer will form into single file, nose to tail and move together by following the white tail that is in front of them.

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11y ago

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