by Shawn Allen

Dinosaurs, most having primitive and underdeveloped digestive systems, often swallowed rocks to aid in their processing of food. The stones would help the creature by grinding the food in their stomachs. 
Quite inefficient, this process also contributed to another of the dinosaurs’ gastric problems: flatulence. After all, they aren’t known as ‘‘thunder lizards’ for nothing . . .

from: The Book of Fragments
(c) Shawn D. Allen.