Hominin footprints were found at a place called Laetoli in Tanzania, which is slightly older than the Australopithecus afarensis fossil skeleton called Lucy found at Hadar in Ethiopia. These footprints indicate that Australopithecus afarensis was capable of walking upright. There's a diorama in the American Museum of Natural History of New York, which depicts the two hominins who left the footprints.