A tail is the section at the rear end of an animal's body, the term particularly referring to such a section which forms a distinct, flexible appendage to the torso. It is the part of the body that roughly corresponds to the sacrum and coccyx in mammals and birds. Tails are mostly a feature of vertebrates, however some invertebrates have tail-like appendages, such as the tail of the scorpion, or the furcula of the springtail.

Function

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Tails have evolved to perform various different functions in animals. Perhaps the oldest tails are those used by fish and other marine life for locomotion, while some land animals use them for balance (e.g. cats) or even for grasping (e.g. monkeys). Tails can also be useful as for social signals, as used by deer to warn of possible danger, or by domestic dogs to indicate emotions. Different evolutionary pressures have led to armoured tails, some containing venom, as in the case of scorpions. In some species of lizard, the tail is able to be permanently detached from the body if necessary, with the intent of distracting a predator long enough to allow lizard escape. Usually their tails will grow back over time, though generally darker in colour than the original. In most birds, tails consist of feathers of extended length, the function of which is to act as a rudder to balance and steer the bird in flight, also to provide balance when perched.

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