What are rooster wattles?

The wattle of a chicken is the colored flap of skin under the beak of the bird. The comb is the same type of skin on the top of the birds head. Both the wattle and comb have two functions. Chickens do not sweat, the chickens wattle & comb serves as a cooling method whereas the blood circulating inside the bird is close to the surface of these areas and is cooled by ambient temperatures. The other use of these appendages is to attract members of the opposite sex for breeding. A rooster with a strong healthy wattle and comb is likely to produce good strong offspring.