The footprints at Lætoli indicate that

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The footprints at Lætoli were made by very early hominins, likely Australopithecus afarensis, who walked on two legs. This is evident from the shape and size of the footprints, which resemble those of bipedal humans rather than quadrupedal apes. The footprints also indicate that these hominins had an arch in their foot, which is a key adaptation for walking on two legs. The discovery of these footprints was significant because it provided concrete evidence of early hominin bipedalism, which had previously only been inferred from skeletal remains.

The Footprints at Lætoli Indicate That