Lucy in the Trees with Children

Human ancestors spent time in trees as recently as 3 million years ago

Australopithecus afarensis is known to have walked upright, but it's been hotly disputed whether the famous Lucy and her kin spent a lot of time in the branches as well.

Now, though, a study of an A. afarensis child's shoulderblades has indicated that our ancestors were indeed living partly in trees as recently as three million years ago.