Perhaps the world's most famous early human ancestor, the 3.2-million-year-old ape "Lucy" was the first Australopithecus afarensis skeleton ever found, though her remains are only about 40 percent complete (photo of Lucy's bones). afarensis was for about 20 years the earliest known human ancestor species (Africa map). With a mixture of ape and human featuresincluding long dangling arms but pelvic, spine, foot, and leg bones suited to walking uprightslender Lucy stood three and a half feet (107 centimeters) tall. afarensis skulls later found nearby reveal an apelike head with a low and heavy forehead, widely curving cheekbones, and a jutting jawas well as a brain about the size of a chimpanzee's. Inspired by repeated playings of "Lucy in the Sky With Diamonds" at a celebratory party on the day the specimen was found, researchers gave it the Beatles' mod moniker. In addition, the sections of her skullseparated in childrenhad grown together.
The earliest australopithecines very likely did not evolve until 5 million years ago or shortly thereafter (during the beginning of the Pliocene Epoch) in East Africa.
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For one thing, her wisdom teeth, which were very humanlike, were exposed and appear to have been in use for a while before her death.
afarensis males were quite a bit larger than females. A number of factors point to Lucy being fully grown.