How do animals remove their excretory wastes?

Animals perform the different systems from the from the different organs. Excretory system which is found in animals as one of the vital systems of the body is the system which helps animals to remove the excretory waste ,materials from their body to out side. The organs which help in excretion are known as the excretory organs.The main excretory organs of the vertebrates are known as kidneys. Kidneys are paired structures which are bean-shaped and located in the dorsal wall of the abdominal cavity. Human kidneys are not located in the same level, one is located a little bit above than the other. Anyway kidneys are the very important organs of the animals body. They have two important functions:
One is the filtration of blood and the other is urine formation. For that purpose each kidney has its two important functioning parts: The Bowman's capsule- which helps to filter the blood and pass the useful substances present in the blood back to the body cells and the other important functioning part of the kidney is called the uriniferous tubule. It is the elongated tubule of varying diameter which helps to form urine.