Two species of ancient human relatives walked side by side in Kenya 1.5 million years ago

According to the articles, the footprints in question were found in the Turkana Basin and dated to about 1.5 million years ago. Researchers have concluded that these footprints belong to two different species of hominins, our prehistoric relatives. One set of tracks was identified as belonging to an ancient primate, while the other set was left by three Homo Erectus individuals.