Why were mysterious ancient humans found in an African cave all female?

AI Insight

Scientists analyzing fossil proteins from Homo naledi remains found in South Africa's Rising Star cave system discovered that all identifiable specimens were female. This finding deepens the mystery surrounding this enigmatic human species, which lived approximately 236,000-335,000 years ago and exhibited a puzzling mix of primitive and modern anatomical features. The protein analysis provides sex determination where previous skeletal analysis was insufficient, revealing an unexpected pattern that raises questions about the social structure and burial practices of these ancient hominins.

Why it matters

This discovery challenges our understanding of early hominin behavior and social organization, particularly regarding potential sex-specific activities or deliberate placement of remains in the cave system. The findings may provide insights into complex behaviors like intentional burial that were previously thought to be exclusive to later human species.