The domestic chicken is descended primarily from the Red Junglefowl (Gallus gallus) and is scientifically classified as the same species.Chicken as such it can and does freely interbreed with populations of red jungle fowl.The recent genetic analysis has revealed that at least the gene for yellow skin was incorporated into domestic birds through hybridization with the Grey Junglefowl (G. sonneratii).
Researchers have found chickens' bones in unusual amounts and out of natural jungle range, thus denoting a breeding place. Bones of domestic chickens have been found about 6000-4000 BC in Yangshao and Peiligan, China, while the Holocene climate was not naturally suitable for the Gallus species.Archaeological data is lacking for Thailand and southeast Asia.
