Mammalian bones associated with the "A. garhi" remains exhibit cut and percussion marks made from stone tools: the left mandible of an alcelaphine bovid with three successive, unambiguous cut marks presumably made while removing the tongue; a bovid tibia with cut marks, chop marks, and impact scars from a hammerstone, possibly inflicted to harvest the bone marrow; and a "Hipparion" (a horse) femur with cut marks consistent with dismemberment and filleting. However, it is unclear why no stone tools were recovered from this site. Because the Hatayae locality was likely a featureless, grassy lake margin with so few raw materials for making stone tools, it is possible these hominins were creating and carrying tools some ways with them to butchering sites, intending to use them many times before discarding. It was previously believed that only "Homo" could manufacture tools; however, it is also possible that the butcherers were not manufacturing tools and simply used naturally sharp rocks.