Footprints Suggest Different Human Relatives Lived Alongside One Another The New York TimesThese two ancient human relatives crossed paths 1.5 million years ago Nature.comFossil footprints reveal two hominin species crossed paths on same day New AtlasRare footprints suggest two of our prehistoric ancestors may have met The Washington PostMuddy footprints suggest 2 species of early humans were neighbors in Kenya 1.5 million years ago Phys.org