The researchers said the cut marks on the bones appear to have been made by people using stone tools. That represents strong evidence for the presence of our species, Homo sapiens, though no human fossils were found at the site, they added. The marks on the bones were found on the pelvis, tail and body armor. The role of people in the extinction of many large mammals in the Americas also has been a subject of controversy. The Neosclerocalyptus fossils are among the oldest evidence of human interaction with these large Ice Age animals.
