Labels:text | animal OCR: GROWING BONES The bony neck frill, which PROTOCERATOPS was probably used for display, grew langer as Protoceratops grew older. CURVED TAIL The shape of the bones in Protoceratops' tail made it curve downward. SHARP TEETH Behind its sharp, birdlike beak, Protoceratops had a row of cutting teeth. POWERFUL HINDLIMBS Although Protoceratops walked on all four legs, the strong hindlimbs provided most of the power.