Snakes ar extended, legless, meat feeding reptiles of the suborder Serpentes that may be recognized from legless reptiles by their absence of eyelids and out of doors ears. Like all squamates, snakes ar poikilothermous, craniate vertebrates secured in covering scales. various kinds of snakes have skulls with a couple of of|some|many} a much bigger number of joints than their craniate progenitors, empowering them to swallow prey a lot of larger than their heads with their deeply versatile jaws. To suit their restricted bodies, snakes' matched organs, (for example, kidneys) appear one before the opposite instead of one next to the opposite, and most have stand out helpful respiratory organ. many animal varieties hold a girdle support with a handful of minimal paws on either facet of the sewerage.
Living snakes ar found on every terra firma except for Antarctic continent, and on most littler space lots - special cases incorporate some in depth islands, as an example, eire and New Sjaelland, and diverse very little islands of the Atlantic and focal Pacific. in addition, ocean snakes ar so much reaching throughout the Indian and Pacific Oceans. quite twenty families ar presently perceived, containing around five hundred genera and around three,400 species. They run in size from the tiny, ten cm-long string snake to the Python reticulatus of up to six.95 meters long. The fossil species Titanoboa cerrejonensis was thirteen meters long. Snakes ar thought to possess advanced from either tunneling or amphibian reptiles, perhaps amid the geological period, with the foremost timely familiar fossils chemical analysis to somewhere around 143 and 167 Ma back. The differing qualities of innovative snakes showed up amid the Paleocene amount (c sixty six to fifty six Ma back). the foremost seasoned protected depictions of snakes may be found within the borough Papyrus.
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