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Wikipedia: Pelvic spurs are the externally visible portion of the vestigial remnants of legs found on each side of the vent in primitive snakes, such as boas and pythons. The remnants of a pelvis and femur, which have no connection with the spine, simply "floats" in the muscle mass. The femur is protrudes from the snake's body and is covered by a corneal spur, which resembles a claw.
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![Skeleton of a Boelens python showing the bones inside the anal spurs [Skeleton of a Boelens python showing the bones inside the anal spurs]](http://images.ookaboo.com/photo/s/Boelens_python_anal_spurs_s.jpg)