 Johanson assessed it as female based on the one complete pelvic bone and sacrum, which indicated the width of the pelvic opening.Lucy was tall, weighed , and (after reconstruction) looked somewhat like a chimpanzee.The creature had a small brain like a chimpanzee, but the pelvis and leg bones were almost identical in function to those of modern humans, showing with certainty that Lucy's species were hominins that had stood upright and had walked erect.