 OH 5

OH 5 ("Olduvai Hominid number 5", also known as "Zinjanthropus" or "Nutcracker Man"; colloquially as "Dear Boy") is a fossilized cranium and the holotype of the species "Paranthropus boisei".It was discovered in Olduvai Gorge, Tanzania, by archaeologist-paleontologist Mary Leakey in 1959.