
Photo: Yiwenyiwen · CC BY-SA 4.0 (May be cropped or resized)
Passer montanus
Clutch size
Typically 5–6 eggs, hatching in under two weeks
Size
12.5–14cm
Wingspan
About 21cm
Weight
About 24g
The Eurasian tree sparrow is 12.5 to 14cm long, with a wingspan of about 21cm and a weight of about 24g, making it roughly 10% smaller than the house sparrow. The typical clutch is five or six eggs, which hatch in under two weeks (Wikipedia, general species account).
Birds nesting in woodcrete boxes laid their eggs earlier, had a shorter incubation period, and made more breeding attempts per season. The source read gives no plumage, range, habitat or diet information, and does not name Bhutan, so none is stated.