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Because of its small size, he called it the "Taung baby." In fact, its teeth indicate that it was a 3-4 year old child.

This meant that the Taung child must have been bipedal.

In addition, the canine teeth were relatively short.

In the more open environments, bipedalism would very likely have been an advantage.

By 2.5 million years ago, there were at least 2 evolutionary lines of hominins descended from the early australopithecines.

By 3 million years ago, they were common in both East and South Africa.

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