Caption:
Olduvai Hominid number 5 (OH5), nicknamed Nutcracker Man, is a well-preserved fossilized cranium of the species Paranthropus boisei, which lived in Eastern Africa during the Pleistocene, 2.6 million to 11,700 years ago. It was discovered by Mary Leakey in 1959 in Olduvai Gorge, Tanzania.