The excretion of nitrogenous waste such as ammonia and ammonium ions is called Ammonotelism.
Ammonia is highly water soluble and is toxic.
Animals showing Ammonotelism are mainly freshwater aquatic animals e.g. bony fish, Amoeba.
Final Answer : Animals which excrete Ammonia as an excretory product are called Ammonotelic animals and the process of excretion is called Ammonotelism.