Junglefowl domestication now exceeds 26 billion living birds
Chickens are domesticated red junglefowl (Gallus gallus) from Southeast Asia, tamed roughly 8,000 years ago. By 2023 the global flock topped 26.5 billion, with over 50 billion birds produced yearly for meat. Broilers and layers show how intensively breeding split the species into protein machines.
The word comes from Old English ċicen, pronounced much as today, and may echo the bird's own call. Originally it meant a chick, the sense Shakespeare gives it when Macduff grieves for his lost little ones. The vocabulary is rich: a capon is a castrated male, a pullet a young hen under a year old, or under 22 weeks in the poultry trade, and rooster arose in the eighteenth century, perhaps to dodge the sexual overtones of cock. Australians and New Zealanders say chook.
Chickens are round-bodied birds active by day, with short wings and, in most breeds, bare legs. Wild junglefowl fly, but domestic birds are mostly too heavy to manage it. Both sexes carry a fleshy comb and dangling wattles, bigger in males. They are omnivores that scratch the ground for seeds and insects and will take lizards, small snakes and young mice, and they live 5 to 10 years depending on breed. A hen bred for laying can manage more than 300 eggs a year.
Flocks run on a pecking order in which dominant birds eat and nest first. Hens incubate and rear chicks communally, preferring nests that already hold eggs and even rolling in eggs from neighbours, so a flock settles on just a few favourite sites. Roosters crow to warn off rival males and when startled, while hens cluck after laying and to summon chicks. Courtship can open with a circle dance in which the rooster dips the wing nearest the hen, and mating itself is a brief cloacal contact.
Source: Chicken
