Anal spur

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Spurs are the vesligial remnants of legs in primitive snakes, such as boas and pythons. The bone is considered a hip bone, which has no connection with the spine and simply "floats" in the muscle mass. There is sometimes a bone, considered a femure, which sticks out of the snake's side. This primitive femur is then covered by a corneal spur, which resembles a claw. Males' spurs are generally longer and more pointed than females, and are used for clasping and tickling during courtship and mating. Sometimes, they are used during fights, to scratch the opponent.

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