White-headed Munia or White-hooded Nun
Lonchura maja
Common names: White-headed Nun, White-headed Mannikin
Apparently, "White-headed Munia" is the more popular name in England and "White-hooded Nun" in the United States and some parts of Europe. See, Finches and Soft-Billed Birds by Henry Bates and Robert Busenbark
White-headed Munia Webpage by A Birdkeepers Guide to Mannikins & Munias ("Just Bengalese") This site is well done and gives an excellent sequencing of the species.
White Hooded Nun Webpage by Angie's Bird House This site offers an excellent and concise discussion of the White Hooded Nun's physical description, habitat, food, and breeding.
White-headed Munia at Feathered Flyer
Finchworld's "The Nun Index" links to further Nun Information.