
Photo: Kim, Hyun-tae · CC BY 4.0 (May be cropped or resized)
Motacilla alba
Clutch size
3–8 eggs, usually 4–6
Incubation period
Hatch after 12 days, sometimes as late as 16
Size
16.5–19cm; East Asian subspecies up to 21cm
Weight
Average 25g
The white wagtail is a slender bird, 16.5 to 19cm long, with the East Asian subspecies slightly longer at up to 21cm. Its average weight is 25g and the maximum lifespan in the wild is about 12 years (Wikipedia, general species account).
Three to eight eggs are laid, with four to six the usual number, and they begin to hatch after 12 days, sometimes as late as 16. The sources read give no range, habitat or diet information, and do not name Bhutan, so none is stated here.