Brown Fish Owl

The brown fish owl is a large owl, 48 to 61cm long with a wingspan of 125 to 140cm. It occupies a range of over 7,000km and was probably widely distributed about 120,000 years ago, but after the last glacial period began it disappeared from the western part of its range (Wikipedia, general species account).

The only source read for the Bhutan guide gives this history and the measurements. No plumage, diet, voice or habitat information was found, so none is stated, and its occurrence in Bhutan is flagged for checking.