'''Snakes''' are long, [[limb]]less, [[scale|scaly]] [[reptile]]s which [[slither]] upon the ground and sometimes swim in [[water]]. Some snakes are [[poison]]ous. Snakes are abundant in warmer climates, and many of them are quite harmless to man.
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'''Snakes''' are long, [[limb]]less, [[scale|scaly]] [[reptile]]s which [[slither]] upon the ground and sometimes swim in [[water]]. Some snakes (about one third of species) are [[poison]]ous (venomous). Snakes are abundant in warmer climates, and most of them are quite harmless to man.
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==The origin of snakes: Evolutionary View==
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Snakes are suborder within the order of ''Squamata'', class of reptiles (''Reptilia''), subphylum vertebrats, phylum ''Chordata''. They originate from lizard-like reptiles with legs. Their ancestors probably lived under the ground and lost their legs. The most primitive snakes (''Boidae'' and ''Pythonidae'') still have rudimentary back limbs.