Ammonia, Urea and Uric acid are all types of nitrogenous wastes excreted by animals whereas uric acid can be excreted with the least water.
In the body, nitrogenous wastes tend to form toxic ammonia, which must be excreted. Humans and other mammals excrete urea, whereas birds, reptiles, and some terrestrial invertebrates excrete uric acid. When animals consume more nitrogen than they can use, they excrete nitrogenous waste. Nitrogen is primarily found in amino acids and thus proteins. This means that if an animal consumes a high-protein diet, it will have excess nitrogen to get rid of because there is no long-term storage for it.
Uric acid is a purine-like compound found in nucleic acids. It is water insoluble and tends to form a white paste or powder; birds, insects, and reptiles excrete it.
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