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(a) Assessing pit depth from Panda nut-cracking hammerstones using three-dimensional models. (1) Photograph (Sony Nex6); (2) three-dimensional scan (NextEngine laser scanner); (3) topographic model of the pitted area (Geographic Information System (GIS)). (b) Refit of broken hammerstone, each part was independently used as a hammer at two Panda cracking sites that were 37 m apart.
