What is snakes spurs?

Snakes' spurs are small, bony structures that protrude from the upper surface of the pelvic bone on either side of the cloaca. They are remnants of hind limbs that gradually faded away during the course of evolution. Not all snakes have spurs, and their size and shape vary between species. Some examples of snakes with spurs are pythons, boas, and rattlesnakes. The function of the spurs is unclear, but they may serve as attachment points for muscles or play a role in mating behavior among some species. In most species, the spurs serve no functional purpose and are simply vestigial structures from snakes' evolutionary past.