Lagomorpha - Hares and Rabbits

Did you know that rabbits eat their own droppings?

Normal fecal pellets that are brown. Thats is dry and mostly undigested fibre.
Cecotropes or "Night Droppings". These are darker in colour and sometimes bunched. The nutrients aren't absorbed very effectively and when they get to the colon are forced back (called reverse peristalsis) into the cecum where it is broken down into simple sugars. This then passes through the colon and is ejected as pellets.
The pellets are then eaten by the animal. This is also called hind gut fermentation.