
Photo: Imran Shah from Islamabad, Pakistan · CC BY-SA 2.0 (May be cropped or resized)
Mycerobas carnipes
Habitat
Boreal forests
Range
Afghanistan, Bhutan, China, India, Iran, Myanmar, Nepal, Pakistan, Russia, Tajikistan, Turkmenistan and Uzbekistan
The white-winged grosbeak is a finch found in Afghanistan, Bhutan, China, India, Iran, Myanmar, Nepal, Pakistan, Russia, Tajikistan, Turkmenistan and Uzbekistan. Its natural habitat is boreal forest (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It gives no plumage, size, diet or breeding information, so none is stated.