What behavior is universally recognized as the white-tailed deer's signature alarm signal?

Answer

Conspicuous tail flashing, displaying the white underside of the tail.

The white-tailed deer is universally known across North America for a specific visual warning signal used when alerted to danger or danger detection. This behavior involves raising its tail, which prominently exposes the bright white underside, resulting in a conspicuous flash of color as the deer flees. This tail flagging is a shared, defining trait within the genus *Odocoileus*, although the precise manner of carriage can vary slightly between species.

What behavior is universally recognized as the white-tailed deer's signature alarm signal?
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