
Photo: Cody Delano · CC BY 4.0 (May be cropped or resized)
Larus fuscus
Clutch size
Normally 3 eggs
Size
51–64cm
Wingspan
124–150cm
Weight
452–1,100g
The lesser black-backed gull is 51 to 64cm long with a wingspan of 124 to 150cm and weighs 452 to 1,100g, the nominate race averaging slightly smaller than the other two subspecies. Males, at an average of 824g, are slightly larger than females, at an average of 708g. Normally three eggs are laid (Wikipedia, general species account).
The only source read for the Bhutan guide gives these measurements and the clutch size. No plumage, range, habitat or diet information was found, so none is stated, and its occurrence in Bhutan is flagged for checking.