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Muddy footprints suggest 2 species of early humans were neighbors in Kenya 1.5 million years ago

Scientists study fossil footprints for clues about co-existing species of early human ancestors at the excavation site on the eastern side of Lake Turkana in northern Kenya, in 2022. (Neil Thomas Roach via AP)

Scientists study fossil footprints for clues about co-existing species of early human ancestors at the excavation site on the eastern side of Lake Turkana in northern Kenya, in 2022. (Neil Thomas Roach via AP)

An aerial view shows a research team standing alongside the fossil footprint trackway at the excavation site on the eastern side of Lake Turkana in northern Kenya, 2022. (Louise Leakey via AP)

An aerial view shows a research team standing alongside the fossil footprint trackway at the excavation site on the eastern side of Lake Turkana in northern Kenya, 2022. (Louise Leakey via AP)

Scientists study fossil footprints for clues about co-existing species of early human ancestors at the excavation site on the eastern side of Lake Turkana in northern Kenya, in 2022. (Neil Thomas Roach via AP)

Scientists study fossil footprints for clues about co-existing species of early human ancestors at the excavation site on the eastern side of Lake Turkana in northern Kenya, in 2022. (Neil Thomas Roach via AP)