Gastrolith with a grinding of food to help digestion. Reptiles and mammals of different teeth, there is no differentiation of form and function. Mammals have specialized grinding food, white teeth (molars), eating the right foods, in particular, is a full grind plant food, after digestion and absorption by the gastrointestinal. but reptiles do not molars, with the animal's teeth patterns are the same. crawling animal's teeth, only the cutting action of the bite, usually do not wear Chan features. did not grind the food is not digestible, nutrient absorption is difficult, in particular, like an earthquake this huge dragon dinosaur eat every day a surprising number of plant branches and leaves, how to digest? dinosaur evolution in the long term, access to go through the gastrolith grind food to help digestion characteristics. they eat at the same time eating some of a certain size of the stone, and let the stones remain inside the crop and gizzard. In the cyst developed a strong muscle contraction, the stone repeated on food extrusion, friction, ultimately crushed raw food. full of food, after grinding through the digestion in the intestines break down nutrients absorbed by the intestinal wall, sent the body by the blood circulation for cell use, the formation of fecal residue be excreted from the cloaca Kong. The above description will enable us to better understand those who head small, weak teeth, sauropod dinosaur, is how processed they swallowed a large number of food. Many dinosaur fossil skeleton, are the preservation of gastrolith. This shows that the dinosaur digestion process and today's birds are very similar to the digestive process.