Has the Earth's sixth mass extinction already arrived?

Wednesday, March 2, 2011 - 13:31 in Paleontology & Archaeology

With the steep decline in populations of many animal species, from frogs and fish to tigers, some scientists have warned that Earth is on the brink of a mass extinction like those that occurred only five times before during the past 540 million years. Each of these 'Big Five' saw three-quarters or more of all animal species go extinct.

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