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Pyrrhula erythrocephala
Habitat
Temperate forests
Range
Across the Himalayas and adjacent highlands: Bhutan, northern India, Nepal and adjacent southern Tibet
The red-headed bullfinch is a finch found all across the Himalayas and adjacent highlands, in Bhutan, northern India, Nepal and adjacent southern Tibet. Its natural habitat is temperate 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.