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Driven to extinction

发布时间:2019-03-08 08:10:01来源:未知点击:

HUMANS, rather than climate change, may have driven an ostrich-sized Australian bird to extinction 50 000 years ago. More than 40 Australian animals vanished at roughly the same time, but accurately dating their bones is difficult. Instead, Gifford Miller of the University of Colorado at Boulder and his colleagues have dated hundreds of eggshell fragments from the extinct bird Genyornis (Science, vol 283, p 205). “Eggshells are a vastly superior medium for dating,