More than twenty families area unit at this time perceived, involving around five hundred genera and around three,400 species.They range in size from the minor, 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 area unit thought to own developed from either tunneling or amphibian reptiles, perhaps amid the Jurassic period, with the foremost prompt proverbial fossils qualitative analysis to somewhere around 143 and 167 Ma previous. the various qualities of innovative snakes showed up amid the Paleocene epoch amount (c sixty six to fifty six Ma back). the foremost seasoned protected depictions of snakes is found within the borough Papyrus.
Most species area unit atoxic and people that have venom use it essentially to murder and curb prey as hostile for preservation. Some have venom sufficiently robust to cause harrowing damage or end to folks. atoxic snakes either swallow prey alive or murder by alteration.
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