Chimpanzee or Human?

It is easy to distinguish between adult chimpanzee and human skulls. The skull of a young chimpanzee is much smoother and rounder, with less marked brow ridges.(1) It is quite similar to a young human skull. (2) Apes and humans resemble each other more closely when they are young than when they are adults. The same is true of the 2-3 million year old Australopithecus infant. (3)

Skull and mandible of a young individual (c. 4 yrs old) of Pan troglodytes
(chimpanzee)
Date: modern.
Origin: Central Africa. No. V5905/1 & /2.

Replica of skull with mandible of a young individual (c. 6 yrs. old) of Homo sapiens sapiens
(modern human, Caucasoid)
Date: modern.
Origin: United Kingdom. No. A.1990.8.

Replica of skull with restored mandible of a young individual (c. 4 yrs. old) of Australopithecus africanus
(The 'Taung baby')
Date: about 2-3 million years ago.
Found at: Buxton Limeworks, SW of Taung, Bophuthatswana, South Africa.