Eats its Poop | Bob Armstrong's Nature Alaska

Eats its Poop shows a beaver inside its lodge eating its fecal matter.
Beavers deal with cellulose in several ways. Attached to the digestive tract, near the junction of the small and large intestines, is a large pouch, called the cecum. It is filled with bacteria that break down cellulose into smaller, more usable molecules. This material is excreted as a special kind of feces, which is dark and soft. Beavers eat this material, passing it through the gut a second time and extracting more of the nutrients and vitamins. Beavers share with rabbits and some other small plant-eaters this curious habit of eating the products of cecal digestion. Digested material that has not been processed by the cecum is lighter and firmer; it is excreted but not eaten.
The above is from Beavers by the Mendenhall Glacier in Juneau, Alaska
This habit of eating their fecal matter is called “caecotrophy.”