The Schaefer mammoth, found in Wisconsin bearing cut marks suggesting it was butchered by humans, is thought by archaeologists to be about 14,500 years old.
The remains are part of a growing body of genetic and archaeological evidence suggesting that humans crossed the Bering land bridge about 22,000 years ago, then moved southward relatively late after melting ice cleared a path through Canada, a new study says.
Photograph courtesy D. Joyce