
Photo: Pieter Prins · CC BY-SA 4.0 (May be cropped or resized)
Ketupa nipalensis
Size
50–65cm
Weight
Probably about 1.5–2.5kg; widely reported 1.3–1.5kg
The spot-bellied eagle-owl is a large owl, 50 to 65cm long. The widely reported weight range is 1.3 to 1.5kg, but this is probably at the low end, possibly from a smaller form or only smaller males, and a more correct average is perhaps 1.5 to 2.5kg (Wikipedia, general species account).
That is all the source read for the Bhutan guide gives. No plumage, range, habitat, diet or voice information was found, so none is stated, and the entry is kept short.