Paranthropus robustus was a type of human that lived a long time ago. They looked a bit like us, but were much smaller and had different features. They had big, strong jaws and teeth because they ate tough foods like roots and nuts. Their forehead was very low, which meant they didn't have as much brain space as we do. They walked on two legs like us, but probably spent a lot of time climbing and living in trees too. They lived in Africa a long time ago and are no longer around today. Scientists study their bones to learn more about what life was like a long time ago.