 "Sahelanthropus tchadensis" lived close to the time of the chimpanzee–human divergence, and is likely an ancestor to "Orrorin", a species of Homininae that lived about one million years later.It may have been ancestral to both humans and chimpanzees (which would place it in the tribe Hominini), or alternatively an early member of the tribe Gorillini.Existing fossils include a relatively small cranium, five pieces of jaw, and some teeth, making up a head that has a mixture of derived and primitive features.