Chicken (Gallus gallus domesticus) is a poultry that is usually kept for its meat, eggs and feathers. Domestic chickens are direct descendants of a subspecies of jungle fowl known as the red jungle fowl (Gallus gallus) or bangkiwa chicken (bankiva fowl). All chickens are theropods like tyrannosaurs. Cross-breeding between chicken breeds has produced hundreds of superior lines or pure lines with various functions; the most common are broiler chickens (to be cut) and laying hens (to take the eggs). The common chicken can also be crossed with its close relative, the green jungle fowl, which produces a barren hybrid whose male is known as the bekisar chicken.

Chicken supplies two sources of protein in food: chicken meat and eggs.

The traditional view of poultry farming on the domestication of this species is set out in the Encyclopædia Britannica (2007): "Humans first domesticated chickens of Indian origin for cockfighting purposes in Asia, Africa and Europe. No special attention was paid to egg or meat production. | dikdik jakaria