Fossil bones of the large armadillo relative Neosclerocalyptus found in Argentina show cut marks indicating butchering by humans around 21,000 years ago, suggesting an earlier human presence in southern South America than previously believed. These glyptodonts, similar to modern armadillos but larger, had distinctive marks on the pelvis, tail, and body armor made by stone tools. The discovery challenges the traditional timeline of human arrival in the Americas, potentially pushing it back by about 6,000 years. The findings provide strong evidence of Homo sapiens interacting with Ice Age animals and offer insight into early human activity in the region.