The main internal organs of the chicken are chicken lungs, chicken heart, chicken liver, chicken kidney, chicken intestine, and chicken spleen.

Chickens are a type of poultry. Domesticated chickens originated from the wild Procellarias, which have been domesticated for at least about 4,000 years, but it was not until around 1800 that chicken meat and eggs became mass-produced commodities. Types of chickens include turkeys, crows, pheasants and so on. And the chicken is also a genus in the 12 zodiac signs.

Reproductive System

The reproductive system of the chicken is different from that of fetal mammals. The testes and epididymis of the rooster are in the abdominal cavity, the mating organs are degenerated genital protuberances, and the head of the spermatozoon is long and conical. Sperm can survive for up to 24 days in the nest of sperm glands in the hen's oviduct and are capable of fertilization.

The hen can ovulate every 25 hours or so, only the left ovary and oviduct develop, and the fertilized egg will pause in development before it reaches the critical level for hatching (24°C) after it is discharged from the hen's body.