Cottonmouths, and other snakes, often vibrate their tails when stressed. This action serves to alert others to their presence and deter predators. It may be used as a warning signal in the case of venomous snakes, or a form of mimicry in non-venomous snakes. In fact, recent research has suggested that tail vibrations in snakes predated the evolution of rattles in rattlesnakes.
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