All fowl have a crest on their head. It consists of a flap of skin and is particularly large and noticeable on cocks. The serrated comb, which looks like a blazing fire, is the best known. In addition, there are butterfly, rose and pea-shaped combs.

Fun facts

* If the comb has a strong red colour, this indicates that the cock is healthy.

* Roosters will occasionally make a patterned series of clucks to attract hens to a source of food, the same way a mother hen does for her chicks.