A snake is an elongate reptile of the suborder Serpentes. Like all reptiles, snakes are ectothermic and covered in scales. All snakes are carnivorous and can be distinguished from legless lizards by the lack of eyelids, hind limbs and external ears. Snakes are found on every continent except Antarctica and range in size from the tiny, 10 cm long thread snake to pythons and anacondas of up to 7.6 m (25 ft) in length. In order to accommodate snakes' narrow bodies, paired organs (such as kidneys) appear one in front of the other instead of side by side. Most species are non-venomous and those that have venom use it primarily to kill and subdue prey rather than for self-defense. Some possess venom potent enough to cause painful injury or death to humans. Snakes are thought to have evolved from either burrowing or aquatic lizards during the Cretaceous period (c 150 Ma). The diversity of modern snakes appeared during the Paleocene period (c 66 to 56 Ma). A literary word for snake is serpent, a Middle English word which comes from Old French, and ultimately from *serp-, "to creep"[1], also ερπω in Greek. The serpent is also a symbol of medicine due to its association with Asclepius, the Greek god of medicine. Fifteen families are currently recognized comprising 456 genera and over 2,900 species.[2][3]

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