Fig. 1.

a The geographic distribution of the four junglefowl species. The sympatric geographic regions between the Indian red junglefowl (Gallus gallus murghi) and the Grey junglefowl on the Indian subcontinent and between the Javanese red junglefowl (Gallus gallus bankiva) and the Green junglefowl on the Indonesian Islands are annotated with dots on the map. The map was drawn by overlaying the distribution map of each species obtained from the Handbook of the Birds of the World (consulted in December 2018). Autosomal—b principal component and c admixture analysis. Junglefowl species photo credits: Peter Ericsson (Red junglefowl), Clement Francis (Grey junglefowl), Markus Lilje (Ceylon junglefowl), and Eric Tan (Green junglefowl)