article: Squamata
links: Lacertilia Naja Boidae Morphology (biology) Upper Triassic Early Jurassic Serpentes Viperidae Permian Gekkota Toxicofera Gila monster Ambush predator Jurassic Iguania Scleroglossa Tuatara Sauria Lower Jurassic Holocene Crocodilia Coevolution Anaconda New Zealand Amphisbaenia Scale (zoology) Natural selection