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Anal spur

 
Anal Spur

 
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Anal spurs are the vestigial
Vestigial structure

Vestigiality describes homology character of organisms which have seemingly lost all or most of their original function in a species through evolution....
 remnants of legs found on each side of the vent
Cloaca

In zoological anatomy, a cloaca is the posterior opening that serves as the only such opening for the alimentary tract and urinary tract of certain animal species....
 in primitive snakes, such as boas and pythons. The bone
Bone

Bones are rigid organ that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red blood cell and white blood cells and store minerals....
 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 femur
Femur

The femur, or thigh bone, is the most proximal bone of the leg in vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs....
, which sticks out of the snake's side.






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Anal Spurs
Anal spurs are the vestigial
Vestigial structure

Vestigiality describes homology character of organisms which have seemingly lost all or most of their original function in a species through evolution....
 remnants of legs found on each side of the vent
Cloaca

In zoological anatomy, a cloaca is the posterior opening that serves as the only such opening for the alimentary tract and urinary tract of certain animal species....
 in primitive snakes, such as boas and pythons. The bone
Bone

Bones are rigid organ that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red blood cell and white blood cells and store minerals....
 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 femur
Femur

The femur, or thigh bone, is the most proximal bone of the leg in vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs....
, which sticks out of the snake's side. This primitive femur is then covered by a corneal spur, which resembles a claw
Claw

A claw is a curved, pointed appendage, found at the end of a toe or finger in most mammals, birds, and some reptiles. Somewhat similar fine hooked structures are found in arthropods such as beetles and spiders, at the end of the leg or Arthropod leg for gripping a surface as the creature walks....
. Males' spurs are generally longer and more pointed than females', and are used for clasping and tickling during courtship
Courtship

Courtship is the traditional dating period before engagement and marriage. During a courtship, a couple dates to get to know each other and decide if there will be an engagement....
 and mating
Mating

In biology, mating is the pairing of same-sex, opposite-sex or hermaphrodite organisms for copulation and, in social animals, also to raise their offspring....
. Sometimes they are used during fights to scratch the opponent.