The process of removal of waste products from the body is called as excretion.
On the basis of type of excretory products :
Ammonotelism :
- Excretion of ammonia.
- Bony fishes,aquatic amphibians and aquatic insects.
Ureotelism :
- Excretion of urea.
- Mammals, many terrestrial amphibians and marine fishes mainly excrete urea.
Uricotelism :
- Excretion of Uric acid.
- Reptiles, birds, land snails and insects excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of water.
