Snakes square measure extended, legless, savage reptiles of the suborder Ophidia that may be recognized from legless reptiles by their absence of eyelids and out of doors ears. Like all squamates, snakes square measure cold-blooded, vertebrate vertebrates secured in covering scales. varied kinds of snakes have skulls with range of|some|many} a much bigger number of joints than their reptilian precursors, empowering them to swallow prey a lot of larger than their heads with their passing transportable jaws. To oblige their restricted bodies, snakes' matched organs, (for example, kidneys) appear one before alternative|the opposite} instead of next to every other, and most have one and solely sensible respiratory organ. many animal classes hold a girdle support with some of lowest paws on either aspect of the drainpipe.
Living snakes square measure found on every earth with the exception of Antarctic continent, and on most littler space lots - special cases incorporate some in depth islands, for instance, eire and New Seeland, and various very little islands of the Atlantic and focal Pacific. Also, ocean snakes square measure across the board at some point of the Indian and Pacific Oceans. over twenty families square measure immediately perceived, involving around five hundred genera and around three,400 species. they are going in size from the little, ten cm-long string snake to the python of up to six.95 meters long. The fossil species Titanoboa cerrejonensis was thirteen meters long. Snakes square measure thought to possess developed from either tunneling or amphibian reptiles, perhaps amid the geological period, with the earliest noted fossils qualitative analysis to somewhere around 143 and 167 Ma back. the numerous qualities of current snakes showed up amid the Paleocene epoch amount (c sixty six to fifty six Ma prior). the foremost established safeguarded portrayals of snakes is found within the borough Papyrus.
Most species square measure atoxic and people that have venom use it basically to execute and curb prey as hostile for preservation. Some have venom sufficiently robust to induce agonising damage or ending to folks. atoxic snakes either swallow prey alive or execute by narrowing.
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