Hominids, a group that includes humans and their closest relatives, all walk upright on two feet. Humans are the only hominids that live today. Additional evidence of early hominids was found in 1974 by anthropologist Donald Johanson. He found many pieces of a single hominid skeleton, which was dated to at least 3 million years ago. He named his historic find Lucy. After studying Lucy's skeleton, he found that Lucy was a girl and she was 4 feet. (1.2 meters) tall. I got this answer right in my notebook so I hope it helps you.