Research suggests that early humans in Africa may have interbred with a mysterious, extinct species. There is also evidence of interbreeding between early humans and other archaic species, such as Neanderthals and Denisovans, although the timing and extent of this interbreeding are not certain. The discovery of potential genetic legacies from these interactions is being explored in various studies, with some findings indicating possible connections to modern human populations in regions like Australia and Papua New Guinea.