Here is the accompanying graphic, from the NYT.
The Ardipithecus specimen, an adult female, probably stood four feet tall and weighed about 120 pounds, almost a foot taller and twice the weight of Lucy. Its brain was no larger than a modern chimp’s. It retained an agility for tree-climbing but already walked upright on two legs, a transforming innovation in hominids, though not as efficiently as Lucy’s kin.Ardi’s feet had yet to develop the arch-like structure that came later with Lucy and on to humans. The hands were more like those of extinct apes. And its very long arms and short legs resembled the proportions of extinct apes, or even monkeys.
Every so often, a find comes around and galvanizes the scientific world. This is one such find. A. afarensis is a good case for a transitional form. Ardipithecus ramidus is so much more. It also shows, in true evolutionary fashion, that the transition to bipedalism took place over a considerable period of time and happened in mosaic fashion.
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