Snakes are elongated, legless, carnivorous reptiles of the suborder Serpentes[2] that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls essential more joints than their lizard ancestors, enabling the swallow prey much bigger their heads with their highly mobile jaws. To accommodate their narrow bodies, snakes’ paired organs (such as kidneys) appear one looking at the other instead of side by side, and have only one functional lung. Some species retain a pelvic girdle along with a pair of vestigial claws on either side from the cloaca. Living snakes are normally found on every continent except Antarctica, and on most smaller land masses; exceptions include some large islands, such as Ireland, Iceland, Greenland, the Hawaiian archipelago, and the islands newest Zealand, and many small islands of the Atlantic and central Pacific oceans. Additionally, sea snakes are widespread the actual Indian and Pacific Marine environments. More than 20 families are currently recognized, comprising about 500 genera and about 3,400 species.They range in size from the tiny, 30.4 cm (4.1 in)-long thread snake[6] to the reticulated python of half a year.95 meters (22.8 ft) in
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