Kidneys are bean shaped organs present in pairs i vertebrates. These are an excretory organ. Nephron is the basic structural and functional unit of kidneys. It excretes the nitrogenous wastes in the form of urine which is continuously formed.
Kidneys are also play major role in body homeostasis by maintaining the electrolyte, acid-base and fluid balance of the blood.
Kidneys are act as a hormone because it produces the erythropoietin hormone which help in the formation of red blood cells in the human body.
The kidney is referred to as an excretory organ because it excretes nitrogenous wastes. It is also a major homeostatic organ because it maintains the electrolyte Acid-Base, and fluid balance of the blood.
The reason is because of the theory "the path of least resistance." The bird is not touching anything else, so it doesn't become our fried birdie dinner.
