Scientists discovered 1.5-million-year-old footprints in northern Kenya, showing Paranthropus boisei and Homo erectus lived alongside each other. Found at Koobi Fora, these tracks suggest the species may have crossed paths, raising questions about interspecies interaction and competition.
Paranthropus boisei, with ape-like feet and large molars, had a flat-footed gait, while Homo erectus walked upright with modern foot structure. The tracks highlight differing diets—boisei foraged tough plants, while erectus ate meat and used tools.
This shared lakeshore environment, despite dangers from predators, likely provided vital resources for both species. Homo erectus thrived long after boisei vanished, possibly contributing to modern human ancestry.