this species was bipedal but kept several ape-like characteristics such as adaptations for tree climbing, a tiny brain, and a large mouth. many cranial traits, such as a low, sloping forehead, a projecting face, and pronounced brow ridges above the eyes, were ape-like. another thing we can learn is the anatomy of the knee joint indicated that it belonged to a species that walked on two legs, and it was the oldest evidence of a biped at the time.