Determining what extinct dinosaurs ate is difficult, but we can infer some aspects of their dietary preferences.
Traditionally this information has been derived from direct evidence, such as stomach contents, and indirect evidence, such as establishing a correlation between particular body characteristics and diets of living animals and then inferring habits for dinosaurs.
Animals such as house cats and dogs have large, stabbing canine teeth at the front of the mouth and smaller, equally sharp teeth farther back in their jaws.
Many of these animals are also armed with sharp claws.
The advantage of teeth and claws as predatory tools is obvious.
Now consider animals like cows, horses, rabbits, and mice.
These animals have flat teeth at the back of the jaw that are analogous to and have the samefunction as grindstones.
Unlike the meat-slicing and stabbing teeth of carnivores, the teeth of these animals grind and shred plant material before digestion.