Chickens also give a low "warning call" when they sense a predator approaching. Under natural conditions, most birds lay only until a clutch is complete, and they will then incubate all the eggs.
Roosters can usually be differentiated from hens by their striking plumage of long flowing tails and shiny, pointed feathers on their necks (hackles) and backs (saddle), which are typically of brighter, bolder colours than those of females of the same breed.
However, in some breeds, such as the Sebright chicken, the rooster has only slightly pointed neck feathers, the same colour as the hen's.
More specifically, mating typically involves the following sequence: 1. The broody hen will stop laying and instead will focus on the incubation of the eggs (a full clutch is usually about 12 eggs).
She will "sit" or "set" on the nest, protesting or pecking in defense if disturbed or removed, and she will rarely leave the nest to eat, drink, or dust-bathe.
However, roosters may also crow in response to sudden disturbances within their surroundings. There is evidence that individual hens prefer to be either solitary or gregarious nesters.