Identify one structure in the rat that you will not find in the human digestive system?

One structure in the rat that is not found in the human digestive system is the cecum, which is significantly larger and more developed in rats. The rat's cecum functions as a fermentation chamber for digesting cellulose from plant materials, which is more prominent in their herbivorous diet. In humans, the cecum is present but is much smaller and does not play as significant a role in digestion.