A piece of evidence in favor of including Sahelanthropus tchadensis (Toumai)with the hominins rather than apes is that the species was likely:

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Sahelanthropus tchadensis (Toumai) was known to be bipedal, which is a key characteristic of hominins, whereas apes are quadrupeds with a specialized anatomy for tree dwelling. This places Toumai within the hominin lineage rather than the ape lineage.

A Piece of Evidence in Favor of Including Sahelanthropus Tchadensis