Fossil hand anatomy suggested that:

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Fossil hand anatomy has revealed that some australopithecines had hand proportions associated with tool-making capabilities, suggesting that they were physically capable of making stone tools. While Homo habilis is known for having made stone tools, the hand anatomy of this species is not the sole determining factor in their tool-making abilities. Likewise, Homo erectus is also known for making stone tools, but this does not discount the possibility that other hominins before them were also capable of tool-making.

Fossil Hand Anatomy Suggested That