Where have all the megafauna gone? Creatures like mastodons, giant ground sloths, basically the entire Ice Age cast? Scientists know there was a mass extinction in Eurasia and the Americas between 11,000 and 15,000 years ago but the cause of the extinction has remained elusive. Prevailing hypotheses are: the animals were hunted to extinction by humans; climate change in the form of a brief return to ice-age like conditions killed them off; disease brought by humans or their animals when they...
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