Rabbit (Oryctolagus) are species from order of Lagomorpha and family of Leporidae. Based on their diet rabbits are obligatory herbivores. Rabbits have ability to ingest big quantities of food, which passes quickly through their system. Digestion and absorption in stomach and small intestine are similar to those in monogastric animals. Peculiarity of their gastrointestinal system is separation of larger particles from smaller ones in proximal colon, where each particle becomes individually sorted. Bigger particles are being excreted, while smaller ones are recirculating back into appendix. Inside appendix food content is exposed to intestinal microbiome, which in turn produces aminoacids, volatile fatty acids and water soluble vitamins. Some nutrient are then absorbed through wall of the colon, whereas remaining content inside small intestine forms dark colored soft paste, rich in aminoacids, bacteria, vitamins and minerals. Paste is being extracted as specific, nutrient dense faeces named caecotroph, which is then ingested for the second time, as it is important source of nutrients. This digestive strategy is based on bacterial fermentation through which it synthesises nutrients and therefore avoids the need for accumulating large food quantities inside digestive tract, which is another advantage as it reduces amount of time during which rabbits are exposed to danger of predator presence. Core element of nutrition is water which is involved in digestion and absorption of food and also reduces concentration of toxic substances in organism. Carbohydrates are main ingredient of caecotrophs and important source of energy as their importance is irreplaceable for physiology of bowel movement. Rabbits also have ability to use fatty acids as their energy source, while on the other hand proteins are crucial for normal growth, development and immune system function. Another important part of rabbit nutrition are vitamins and minerals which are enabling numerous metabolic processes and regulating concentration of vital nutrients.