The fossil record of snakes, when reviewed, shows no evidence for the origin of snakes by neo-Darwinian evolution. The most common evolutionary theory is that modern snakes developed from four-legged reptiles that lost their legs. As evidence for this theory, evolutionists point to snake spurs and putative vestigial leg structures that exist on some modern snakes. These spurs and other structures are not evidence of legged ancestors, but rather are functional organs that have an important role in mating. It is also shown that evolution from tetrapod to snake would require major anatomical changes in the skeleton and the body organs as well as the production of several new organ systems, such as the sensory system.