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Snakes are limbless reptiles of the squamate suborder Serpentes. Closely related to lizards and the tuatara, snakes are ectothermic, amniote, air-breathing vertebrates with an elongated rope-like body covered by overlapping scales, and they move around using undulatory, rectilinear, concertina, sidewinding or slide-pushing locomotion, with some arboreal species even capable of short-ranged gliding flight by flaring out the ribs to flatten and widen the body for aerodynamic lift. Snakes have skulls with significantly fewer sutures and more hypermobile articulations (i.e.

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