What anatomical feature acted as the heavy-duty clipper at the front of the jaws?

Answer

Beak

The dinosaur possessed a keratinous, parrot-like beak, formed by the premaxilla and predentary bones, which acted as a clipper to sever tough vegetation.

What anatomical feature acted as the heavy-duty clipper at the front of the jaws?
dietpaleontologydinosaurherbivoreXenoceratops