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Lucy is one of the most famous hominins ever found. She was discovered in Hadar, a palaeoanthropological site in the Awash Valley of the Afar Triangle in Ethiopia in 1974. This partial skeleton of a female Australopithecus afarensis is composed of several hundred pieces of fossiled bones representing 40 percent of the individual [1][2][3][4].

Homo ergaster, also known as the “working man” is an extinct species or subspecies of archaic humans that lived in Africa during the Early Pleistocene. The majority of Homo ergaster fossils have been discovered along the shores of Lake Turkana in Kenya including the holotype KNM-ER 992 and the famous Turkana Boy (KNM-WT 15000), which is a nearly complete skeleton [1][2]. Other African sites include the North African sites of Tighenif (formerly Ternifine and sometimes assigned to Homo mauritanicus) in Algeria and Thomas Quarries and Sidi Abderrahman in Morocco; the East African sites of Konso Gardula and Omo in Ethiopia, Olorgesaillie in Kenya, and Olduvai Gorge in Tanzania; and possibly Swartkrans in South Africa, although it is not universally accepted that Homo ergaster was present [3].

Hadar is a famous palaeoanthropological site in Ethiopia’s Afar Region. It is the most prolific hominin site in the Lower Valley of the Awash, a UNESCO World Heritage Site. It is best known for the discovery of “Lucy”, a 3.2 million-year-old partial skeleton of a female Australopithecus afarensis found by Donald Johanson in 1974 [1][2][3][4][5].