The strong points of human which are better than other animal are wisdom, tool and a pair of flexible hand. Why does nature create such a species in this ecological system?

人类唯一比其它动物强的是他的智慧、是对工具的运用以及一双灵活的手。

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And a back-of-the-envelope calculation based on the 1.8m sorts of organism recognised so far as species under the Linnaean system, on the rate at which new species are being discovered and on such ecological matters as the average number of parasites (themselves new species) that each free-living species harbours, suggests the final total may be around 30m.

ECONOMIST: Biodiversity