Generally, bunnies don’t ‘let on’ that they are eating their cecals and not seeing them doesn’t necessarily mean that they aren’t eating them.
Since these are usually taken by the bunny directly from the anus (I know, ew!) it may appear as if your bunny is doing a deep belly groom and yet when he comes up you’ll see him munching away. I see my lop do this from time to time, but have never seen even one of his cecals. My lionhead cross and my mini-rex sometime leave them on the flooring of their habitats or in their litterboxes, usually when the cecals are too nasty to eat, or during times they have both been overweight and couldn’t stretch around far enough to get to their bottoms. Fiver is actually being treated for a condition where his cecals are too pasty to pick up and chew.
I know there’s an article on it somewhere around here:
http://www.bio.miami.edu/hare/poop.html
The Mystery of Rabbit Poop by Dana Krempels, Ph.D.
Surmised it here:
Unlike most other mammals, lagomorphs (including domestic rabbits) produce two types of droppings, fecal pellets (the round, dry ones you usually see in the litterbox) and cecotropes. The latter are produced in a region of the rabbit’s digestive tract called the cecum, a blind-end pouch located at the junction of the small and large intestines. The cecum contains a natural community of bacteria and fungi that provide essential nutrients and may even protect the rabbit from potentially harmful pathogens.
How does the rabbit get those essential nutrients? She eats the cecotropes as they exit the anus. The rabbits blissful expression when she’s engaging in cecotrophy (the ingestion of cecotropes) will tell you that she finds this anything but disgusting. In fact, rabbits deprived of their cecotropes will eventually succumb to malnutrition. Cecotropes are not feces. They are nutrient-packed dietary items essential to your companion rabbit’s good health.
A rabbit may produce cecotropes at various times during the day, and this periodicity may vary from rabbit to rabbit. Some produce cecotropes in the late morning, some in the late afternoon, and some at night. In any case, they usually do this when you’re not watching (quite polite of them). This might be why some people refer to cecotropes as “night droppings,” though cecotropes are not always produced at night. A human face is apparently an excellent and refreshing palate-cleanser, as a favorite activity immediately post-cecotrophy often seems to be “kiss the caregiver”. Mmmmmm.
Had to lol at the last part. I have never gotten a face washing by a bunny after corophagy, thank goodness! ^_^ I’ll take one any other time though!