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From Wikipedia:
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Human beings, or humans (Homo sapiens — Latin: "wise human" or "knowing human") are bipedal primates in the family Hominidae. DNA evidence indicates that modern humans originated in Africa about 250,000 years ago. Humans have a highly developed brain, capable of abstract reasoning, language, introspection, and emotion. This mental capability, combined with an erect body carriage that frees the forelimbs (arms) for manipulating objects, has allowed humans to make far greater use of tools than any other species. Humans now permanently inhabit every continent on Earth, except Antarctica (although several governments maintain permanently- and seasonally-staffed research stations there). Humans also now have a continuous presence in low Earth orbit, occupying the International Space Station. The human population on Earth amounts to over 6.7 billion, as of July, 2008. |
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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 over 5 m 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 the commonness of venomous snakes. Venomous snakes are themselves dangerous irrespective of size, and the largest constrictors are potential man-eaters. All snakes are obligate carnivores.
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