When cells metabolize protein, ammonia is formed. An example of an animal that directly excretes ammonia without further modification is a

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Fish are aquatic animals that live in water, where the ammonia can be easily diluted and excreted through their gills. This is known as ammonotelic excretion. In contrast, birds, snakes, turtles, and humans all need to convert ammonia into less toxic forms such as urea or uric acid before excreting them, as they cannot constantly excrete large amounts of ammonia without harm to themselves.

When Cells Metabolize Protein, Ammonia Is Formed