Woolly mammoths and other large, lumbering beasts faced extinction long before early humans perfected their skills as spearmakers, scientists said.
The prehistoric giants began their precipitous decline nearly 2,000 years before our ancestors turned stone fragments into sophisticated spearpoints at the end of the last ice age.
The animals, which included mammoths, elephant-sized mastodons and beavers the size of black bears, were probably picked off by more inept hunters, who only much later developed specialized weapons when their prize catches became scarce.
“Some people thought humans arrived and decimated the populations of these animals in a few hundred years, but what we’ve found is not consistent with that rapid ‘blitzkrieg’ overkill of large animals,” said Jacquelyn Gill, a doctoral student at the University of Wisconsin, Madison, who led the research team.
Archeological evidence shows that humans developed advanced spearheads about 13,000 years ago. The Clovis people of North America crafted speartips with deep grooves that made wounds bleed freely. With these, hunters did not have to kill their prey on the spot, but could wait for the beasts to bleed to death.
The rise of the Clovis culture was thought to coincide with the demise of the woolly mammoth and other slow-moving giants on the continent, leading many researchers to suspect the animals died at the ends of the hunters’ spears.
Gill’s team rules this out by putting a more accurate date on the decline and fall of woolly mammoths and more than 30 other large mammals that dominated the landscape as the ice sheets retreated from North America.
To date the animals’ slide to extinction, the scientists examined sediment cores from a lake in Indiana. They measured levels of a fungus that is known to thrive in the excrement of giant herbivorous mammals and nowhere else. They reasoned that more fungal spores meant more dung, which in turn reflected a larger population of roaming mammals.
Writing in the US journal Science, the researchers describe how the amount of mammal dung started to fall about 14,800 years ago, long before advanced spearheads became commonplace.
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