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Anthus roseatus
Range
Afghanistan, Bangladesh, Bhutan, China, India, South Korea, Myanmar, Nepal, Pakistan, Thailand and Vietnam
The rosy pipit is a species of the wagtail and pipit family, found in Afghanistan, Bangladesh, Bhutan, China, India, South Korea, Myanmar, Nepal, Pakistan, Thailand and Vietnam (Wikipedia, general species account).
That single sentence is all the source read for the Bhutan guide gives. No plumage, size, habitat, diet or breeding information was found, so none is stated.