Instead of using wood, these Early Upper Paleolithic ancestors crafted their tool from a mammoth tusk. The conclusion comes after an international research team reviewed artifacts recovered from Obłazowa Cave, one of Poland’s most important Paleolithic sites. Archaeologists at the time also unearthed a mammoth tusk boomerang estimated to date back to the same era. At about 2.36 feet wide, the ivory boomerang wasn’t designed to arc through the air and return to its user. “The intentional thinning of the mammoth tusk to achieve symmetry reflects a notable investment in a context where mobility was essential.