A 7.2-million-year-old femur found in Bulgaria reveals early signs of upright walking and reopens the debate on human origins.

“Ankle bones of Purgatorius exhibit features that indicate it lived in trees, so we initially thought its absence south of Montana could be related to the sweeping devastation of forests from the ...

The discovery of two ancient fish in South China has re-written what we thought we knew about the evolution of early vertebrates.