Cecotropes: Why Rabbits Eat Their Own Droppings

New rabbit owners are often alarmed when they first see their rabbit eating something directly from its own bottom. This behaviour — known as cecotrophy — is one of the most essential and fascinating aspects of rabbit physiology. Far from being unhygienic, cecotrophy is a critical nutritional process that provides your rabbit with up to a third of their total nutritional needs.

What Are Cecotropes?

Rabbits produce two distinct types of droppings:

1. Regular fecal pellets: The small, round, dry, brown balls you’re familiar with finding around the enclosure. These are the true waste product — indigestible fibre and other material that has completed the digestive process.

2. Cecotropes (cecotrophs): Soft, grape-like clusters of dark, glossy pellets that smell noticeably stronger than regular droppings. These are produced in the cecum — a large fermentation chamber at the junction of the small and large intestine — and are fundamentally different from fecal waste. They are not waste at all; they are a nutrient-dense food.

The scientific name for the process of eating cecotropes is cecotrophy (sometimes spelled caecotrophy in British English).

Why Are Cecotropes Essential?

Cecotropes are produced overnight and in the early morning, and rabbits eat them directly from the anus as they are produced — you will almost never see them if your rabbit is healthy, because they are consumed immediately.

What do cecotropes contain that makes them so important?

• B vitamins (particularly B12) that are synthesised by gut bacteria during fermentation — rabbits cannot absorb these through the cecal wall; they must be re-ingested
• Short-chain fatty acids — energy source produced by bacterial fermentation
• Beneficial bacteria (a healthy microbiome) — cecotropes effectively re-inoculate the gut with the right bacteria with each cycle
• Amino acids and proteins — cecotropes contain significantly higher protein than regular fecal pellets
• Digestive enzymes — continuing the breakdown of nutrients

Studies estimate that cecotropes provide approximately 15–30% of a rabbit’s total nutritional needs, including nutrients that are completely unavailable through first-pass digestion of hay and vegetables.

The Digestive Cycle Explained

Rabbit digestion works in two passes:

1. First pass: Food (primarily hay) is chewed, swallowed, passes through the stomach and small intestine, and enters the cecum. In the cecum, bacteria ferment plant material, extracting nutrients and producing the cecotrope material.

2. Cecotrope production and re-ingestion: The cecum moves its contents into a special part of the colon, where they are formed into the soft, nutrient-rich cecotropes. These travel to the rectum and are expelled — but the rabbit immediately eats them directly from the anus before they reach the ground. The cecotropes then pass through the stomach and small intestine again, allowing full absorption of all the nutrients.

3. Second pass: The remaining indigestible material continues through the large intestine and is excreted as the familiar round, hard fecal pellets.

When Cecotropes Are Left Uneaten — A Health Warning

If you find soft, grape-like clusters stuck to your rabbit’s fur around the bottom, or accumulating on the floor of the enclosure, this is a sign that cecotropes are not being consumed. This is a health warning sign, not a hygiene problem to simply clean up.

The most common reasons a rabbit stops eating cecotropes:

1. Obesity or Arthritis

The most common cause. If your rabbit is overweight or has joint pain (particularly in the spine and hips), they physically cannot reach their bottom to consume cecotropes. Weight management and pain treatment are essential.

2. Dental Pain

Dental disease can make the act of eating cecotropes from the anus painful. A rabbit with dental problems may avoid this behaviour.

3. Diet Too Rich in Pellets or Treats

A diet high in pellets and treats produces excess cecotropes that exceed what the rabbit needs — the surplus is left uneaten. The solution is to significantly reduce pellets and treats and prioritise unlimited hay.

4. Age (Very Young or Very Senior Rabbits)

Baby rabbits under 3 weeks don’t yet produce cecotropes. Very elderly rabbits with reduced flexibility may struggle to consume them.

5. Stress or Disrupted Routine

Significant stress can disrupt the timing of cecotrope production and consumption.

What To Do About Uneaten Cecotropes

1. Do not clean them up before your rabbit has had a chance to eat them — place them near the rabbit’s mouth if they seem unable to reach them
2. Review the diet — are you offering too many pellets or treats?
3. Assess your rabbit’s weight — obesity is the most common cause; consult your vet about a weight loss plan
4. Check for dental or joint pain — if your rabbit seems uncomfortable or is eating differently, a vet examination is warranted
5. Never add cecotropes to the litter tray — while uneaten cecotropes themselves are not harmful to clean away, the underlying cause needs addressing

The RabbitCare App

Daily observation of your rabbit’s droppings is one of the most important health monitoring habits you can develop. The RabbitCare App (free on Android) includes daily health logs where you can track dropping quality, quantity, and any unusual findings — helping you identify problems early and share clear information with your vet.

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References & Sources

1. House Rabbit Society (HRS) — “Cecotropes and Digestive Health” — rabbit.org
2. Harcourt-Brown, F. (2002) — Textbook of Rabbit Medicine, Butterworth-Heinemann
3. Varga, M. (2014) — Textbook of Rabbit Medicine, 2nd ed., Elsevier
4. Fekete, S. (1989) — “Recent findings and future perspectives of digestive physiology in rabbits” — Acta Veterinaria Hungarica
5. RWAF — “Rabbit Droppings: What’s Normal?” — rabbitwelfare.co.uk