
Photo: Chung Kiu, Ryan Cheng · CC BY-SA 4.0 (May be cropped or resized)
Muscicapa muttui
Size
13–14cm
Weight
10–14g
The brown-breasted flycatcher is 13 to 14cm long and weighs between 10 and 14g (Wikipedia, general species account).
That is all the source read for the Bhutan guide gives. No plumage, range, habitat, diet or breeding information was found, so none is stated, and its occurrence in Bhutan is flagged for checking.