Nitrogenous Wastes Nitrogenous Waste Excretion Product Habitat Animals Ammonia Wate Aquatic invertebrates Bony fishes Amphibian larvae Urea Land Adult amphibians Uric acid Land Insects Birds Reptiles Animals with ample water available produce ammonia, since it is highly soluble in water and thus can be diluted. most terrestrial animals need to conserve water, so they produce urea or uric acid, which require less water because they are less toxic