1.5-million-year-old footprints of 2 different species of human ancestors found at same spot

Researchers have discovered 1.5 million-year-old footprints of two different species of human ancestors at the same spot in Kenya. The prints are believed to belong to the species Homo erectus and Paranthropus boisei. According to an analysis of the footprints led by biologist Kevin Hatala of Chatham University, the footprints at the site were made within hours of each other.