Name the main excertory product of mammals.

Explanation

**Step-by-step Solution:**

1. **Understanding Excretory Products**: Excretory products are waste substances that are eliminated from the body of an organism. In mammals, these products are primarily nitrogenous wastes.

2. **Types of Nitrogenous Wastes**: Mammals produce several types of nitrogenous wastes, including ammonia, urea, and uric acid. However, the form in which these wastes are excreted varies among different groups of animals.

3. **Terrestrial Adaptations**: Mammals, being terrestrial animals, have adaptations that allow them to conserve water. This is crucial for survival in land environments where water may be limited.

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