English: Protoceratops andrewsi is a small ceratopsian dinosaur that lived in the Late Cretaceous of Asia. It was characterized by a large skull with a neck frill and a prominent parrot-like beak at the tip of the jaws. Protoceratops reached about 2 m in length and 180 kg in body mass. While adults were largely quadrupedal, juveniles had the capacity to walk around bipedally if necessary. The hindlimbs were longer than the forelimbs, with four toes bearing flattened, shovel-like claws, which would have been useful for digging through the sand. The tail was long and had an enigmatic sail-like structure, which may have been used for display, swimming, or metabolic reasons.