Roosters and poultry have many varieties and short wings, so they can't fly high; A crow can announce the dawn. The rooster is the national bird of France? The reason is that it is brave, tenacious and aggressive. Hen calls: cluck. Chickens croak: Ji Ji Ji.

The reproductive system of chicken is different from that of viviparous mammals. The testis and epididymis of rooster are in abdominal cavity, the mating organ is a degenerated reproductive process, and the sperm head is a long cone. Sperm can survive for 24 days in the sperm gland fossa in the oviduct of hens, and have the ability of fertilization.