 As a hadrosaurid , Kritosaurus would have been a large bipedal / quadrupedal herbivore , eating plants with a sophisticated skull that permitted a grinding motion analogous to chewing . Its teeth were continually replacing and packed into dental batteries that contained hundreds of teeth , only a relative handful of which were in use at any time . Plant material would have been cropped by its broad beak , and held in the jaws by a cheek @-@ like organ . Feeding would have been from the ground up to ~ 4 meters ( 13 ft ) above . If it was a separate genus , how it would have partitioned resources with the similar and contemporaneous Naashoibitosaurus is unknown . 
