Kenyan Fossil Footprints Reveal Large Paranthropus boisei

A set of 1.43-million-year-old fossil footprints discovered on the eastern shore of Lake Turkana in northern Kenya is reshaping scientific understanding of the extinct human relative Paranthropus boisei, revealing the species was larger than previously thought and exhibited complex social behaviors. The research, published in the Proceedings of the National Academy of Sciences, details 21 footprints left by eight individuals walking together across an ancient mudflat.

The international team of researchers, led by paleoanthropologist Kevin Hatala of Chatham University and the Max Planck Institute for Evolutionary Anthropology, attributed the tracks to Paranthropus boisei based on foot shape and gait. This species, known for its robust skull and massive teeth adapted for chewing tough vegetation, lived alongside Homo erectus, a possible direct ancestor of modern humans, during the Early Pleistocene. The footprints were dated using volcanic ash layers in the surrounding rock.

A key finding was the estimated body size of the individuals. The footprints indicate some Paranthropus boisei individuals may have stood up to 1.8 meters (6 feet) tall and weighed around 75 kilograms (165...