
Photo: (c) Lawrence Hylton, some rights reserved (CC BY) · CC BY (May be cropped or resized)
Phylloscopus intermedius
Range
Asia from the eastern Himalayas to south-eastern China and southern Vietnam
The white-spectacled warbler is a leaf warbler found in Asia from the eastern Himalayas to south-eastern China and southern Vietnam. It was formerly included in the Old World warbler family Sylviidae (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It does not name Bhutan specifically, and gives no plumage, size, habitat, diet or breeding information, so none is stated.