Image: PREHISTORIC MYSTERY: Mastodons feeding on black ash trees. The disappearance of such megafauna has perplexed scientists. COURTESY OF BARRY ROAL CARLSEN, UNIVERSITY OF WISCONSIN-MADISONFrom Scientific American:
Three studies seem to disagree as to when mammoths, saber-toothed cats and other North American megafauna disappeared.
Before humans arrived, the Americas were home to woolly mammoths, saber-toothed cats, giant ground sloths and other behemoths, an array of megafauna more impressive than even Africa boasts today. Researchers have advanced several theories to explain what did them in and when the event occurred. A series of discoveries announced in the past four weeks, at first glance apparently contradictory, adds fresh details to the mystery of this mass extinction.
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