The elimination of nitrogenous wastes as uric acid reduces the physiological demand for water.

Most terrestrial chelicerates cannot afford to use so much water and therefore convert nitrogenous wastes to other chemicals, which they excrete as dry matter.

Reptiles and birds excrete their nitrogenous wastes as uric acid in the form of a white paste.

As with many aquatic animals, most fish release their nitrogenous wastes as ammonia.

After birth, it is the predominant means by which nitrogenous waste is excreted in the urine of these animals.

Biological filters convert the nitrogenous wastes from the fish.

Birds excrete their nitrogenous wastes as uric acid in the form of a paste.

Some plants rely on ammonia and other nitrogenous wastes incorporated into the soil by decaying matter.

There can be anything from one to over a hundred metanephridia for excreting nitrogenous waste, which typically open near the anterior end of the animal.

These use the coral's nitrogenous waste and supply the coral with the organic products of photosynthesis.