A 1.4-million-year-old trail of footprints reveals that a powerful human relative grew nearly as large as us and may have traveled in all-male groups. That size was unexpected because Paranthropus boisei has long been reconstructed largely from skulls rather than complete skeletons. Researchers assigned the footprints to Paranthropus boisei using analytical methods the team introduced in 2024. Earlier work in the same region identified footprints from both Paranthropus boisei and Homo erectus on one ancient surface. Even so, the scene expands Paranthropus boisei beyond the familiar image of a heavily built skull in a museum case.