The Primate Perspective helps us recognize that ... species and enhance our long-term survival prospects. (Photo of Lucy reproduction at the Institute of Human Origins) Source: Guy P.

"Lucy" -- named for the Beatles song "Lucy in ... indicate that she probably had a rather large belly, like a modern ape, reflecting an adaptation to a relatively low-quality, high-bulk diet.

But Lucy and other fossil finds reveal that more than 3 million years ago, a relatively small-brained, ape-faced human ancestor walked steadily on two feet. To get a picture of how Lucy's species ...