300,000-year-old Homo naledi fossils from a South African cave suggest the ancient human relative may have been a female-only species, new study reveals

• The largest (left) and the smallest (right) skulls of Homo naledi found in the Rising Star cave system in South Africa.
• All known skeletons of the ancient human relative Homo naledi discovered in a South African cave system appear to be female, according to a new study that has left researchers questioning what it means for the species.