Scientists said there was new evidence that ancient humans wiped out wild horses in Alaska; other researchers said new evidence showed that climate changes were probably to blame for the extinction of the wild horse, the woolly mammoth, and other large mammals.
Scientists said there was new evidence that ancient humans wiped out wild horses in Alaska; other researchers said new evidence showed that climate changes were probably to blame for the extinction of the wild horse, the woolly mammoth, and other large mammals.