These assumptions have been challenged by the discovery in 2009 of two small pieces of bone airing striations made by stone. One bone was from an antelope sized animal and the other from a bovid the size of a modern cow. The bones were found at Dikika, Ethiopia within the securely dated Sidi Hakoma formation and given an age of million years. By process of elimination, trampling of the bones underfoot by animals, toothmarks or their having been tumbled in a stream were ruled out and the only explanation for the markings appears to be the use of stone to scrape flesh from the bones and striking one of the bones to fracture it and extract the marrow.
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H. habilis is one of the oldest species in the genus Homo . Nevertheless, evidence suggests that in some ways, it was quite similar to species in the genus Australopithecus , especially in aspects of the postcranial skeleton and the small size of its brain. Taking into account body size and shape, locomotion, the masticatory system, and brain size, some scientists suggest that H. habilis had an adaptive strategy more similar to australopiths than to modern humans and should be placed within the genus Australopithecus. Whether or not this is a valid suggestion depends upon how a genus is defined. Scientists disagree as to whether phylogeny (evolutionary relationships) should be given priority over adaptive strategies when defining a genus, or vice versa, a distinction that is not easy to make, especially when dealing with fossil specimens. Currently, H. habilis is placed within the genus Homo because it shares derived traits with other members of the genus to the exclusion of the australopiths.