Snakes are the animals which come in the species of reptiles, they are carnivorous reptiles, unit elongated legless of the suborder Serpents. Like all alternative squamates, snakes area unit heterothermic, craniate vertebrates lined in overlapping scales. To accommodate their slim bodies, snakes' paired organs (such as kidneys) seem one ahead of the opposition rather than aspect by aspect, and most have just one purposeful respiratory organ. Some species retain a pelvis with a combine of undeveloped claws on either aspect of the sewer. Lizards have evolved elongate bodies from the beginning of time while not limbs or with greatly diminishing limbs concerning twenty-five times severally via confluent evolution, resulting in several lineages of legless lizards.
Living snakes area unit found on each continent except continent, and on most smaller land masses; exceptions embody some giant islands, like Eire, Iceland, Greenland, the Hawaiian dry land, and therefore the islands of recent See land, and plenty of little islands of the Atlantic and central Pacific oceans. To boot, ocean snakes area unit widespread throughout the Indian and Pacific Oceans. Quite twenty families area unit presently recognized, comprising concerning 520 genera and concerning three, 600 species. They vary in size from the small, 10.4 cm (4.1 in)-long Barbados thread snake to the python of six.95 meters (22.8 ft.) long.
The fossil species Titan boa cerrejonensis was 12.8 meters (42 ft.) long. Snakes area unit thought to own evolved from either burrowing or aquatic lizards, maybe throughout the geological period, with the earliest proverbial fossils chemical analysis to between 143 and 167 Ma gone. Most species area unit nontoxic and people that have venom use it primarily to kill and subdue prey instead of for self-protection. Some species of snakes possess venom potent enough to cause painful injury or death to humans. Nontoxic snakes either swallow prey alive or kill by constriction.
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