rable ▁weather ▁condition ▁at ▁the ▁time . ▁In ▁the ▁G anges ▁region ▁of ▁India , ▁red ▁j ung lef ow l ▁were ▁being ▁used ▁by ▁humans ▁as ▁early ▁as ▁ 7 , 0 0 0 ▁years ▁ago . ▁No ▁domestic ▁ch icken ▁remains ▁older ▁than ▁ 4 , 0 0 0 ▁years ▁have ▁been ▁identified ▁in ▁the ▁Ind us ▁Valley , ▁and ▁the ▁anti qu ity ▁of ▁ch ick ens ▁recovered ▁from ▁exc av ations ▁at ▁Moh en j od aro ▁is ▁still ▁deb ated . ▁ ▁Hy brid isation ▁The ▁other ▁three ▁members ▁of ▁the ▁genus ▁— ▁Sri ▁L anka ▁j ung lef ow l ▁( G . ▁la f ay et ii ), ▁grey ▁j ung lef ow l ▁( G . ▁son ner ati i ), ▁and ▁the ▁green ▁j ung lef ow l ▁( G . ▁vari us ) ▁— ▁do ▁not ▁usually ▁produce ▁fert ile ▁hy br ids ▁with ▁the ▁red ▁j ung lef ow l . ▁ ▁However , ▁supporting ▁the ▁hypothesis ▁of ▁a ▁hy brid ▁origin , ▁research ▁published ▁in ▁ 2 0 0 8 ▁found ▁that ▁the ▁gene ▁responsible ▁for ▁the ▁yellow ▁skin ▁of ▁the ▁domestic ▁ch icken ▁most ▁likely ▁origin ated ▁from ▁the ▁closely ▁related ▁grey ▁j ung lef ow l ▁and ▁not ▁from ▁the ▁red ▁j ung lef ow l . ▁Similarly , ▁a ▁ 2 0 2 0 ▁study ▁that ▁anal ys ed ▁the ▁whole ▁genom es ▁of ▁Sri ▁L anka ▁j ung lef ow l , ▁grey ▁j ung lef ow