Define coprophagy.

Explanation

**Step-by-Step Solution:**

1. **Definition of Coprophagy**: Coprophagy refers to the behavior of certain organisms that consume their own feces or the feces of other animals. This behavior is primarily observed in some herbivorous animals.

2. **Purpose of Coprophagy**: The main reason for coprophagy is to obtain nutrients that were not fully digested the first time the food passed through the digestive system. This is particularly important for animals that consume high-fiber diets, such as those containing cellulose.

3. **Role of Bacteria**: In many coprophagous animals, bacteria present in the cecum or vermiform appendix help in breaking down tough cellulose into simpler forms. These bacteria digest the cellulose, making it easier for the host organism to absorb the nutrients.

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