Scientists have discovered a collection of ancient hominin fossils, possibly all female, in a cave, sparking interest in understanding the reason behind the single sex. The fossils are believed to be from the species Homo naledi, although the location of the cave is unclear, with reports variously suggesting it could be in china or elsewhere. The discovery may shed new light on human origins, but it is also unclear how it relates to other findings, such as the hunting of large mammals by ancient humans.