What is snake

A snake is an elongate reptile of the suborder Serpentes. Like all reptiles, snakes are covered in scales. All snakes are carnivorous and can be distinguished from legless lizards by their lack of eyelids, limbs, external ears, and vestiges of forelimbs. The 2,700+ species of snakes spread across every continent except Antarctica ranging in size from the tiny, 10 cm long thread snake to pythons and anacondas at 9 m (30 ft) long. In order to accommodate snakes' narrow bodies, paired organs (such as kidneys) appear one in front of the other instead of side by side. The snake is one of the most feared animals because of a lack of understanding of the animal. While many species of snake can be dangerous to humans if mistreated, more people die every year from lightning strikes than from snake bites. While venomous snakes comprise a minority of the species, some possess potent venom capable of causing painful injury or death to humans. However, venom in snakes is primarily for killing and subduing prey rather than for self-defense. Snakes may have evolved from a lizard which adapted to burrowing during the Cretaceous period (c 150 Ma), though some scientists have postulated an aquatic origin. The diversity of modern snakes appeared during the Paleocene period (c 66 to 56 Ma). A literary word for snake is serpent (a Middle English word which comes from Old French, and ultimately from *serp-, "to creep"[1]). In modern usage, the term "serpent" usually refers to a mythic or symbolic snake. The serpent is also the symbol of the healing arts.

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セサミン ムダ毛処理 育毛剤ランキング 青汁ランキング ペニス増大 千年ケフィア 口コミ 医師・転職ランキング






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