section_path: Vertebrate skeletons/Amphibians and reptiles
section_name: Amphibians and reptiles
paragraph_text: Amphibians and reptiles
  
  The skeletons of turtles have evolved to develop a shell from the ribcage, forming an exoskeleton. The skeletons of snakes and caecilians have significantly more vertebrae than other animals. Snakes often have over 300, compared to the 65 that is typical in lizards.