
Photo: (c) Tom Field, some rights reserved (CC BY) · CC-BY (May be cropped or resized)
Riparia diluta
Habitat
Open habitats such as farmland, grassland and savannah, usually near water
Range
Central Asia to south-eastern China
The pale martin, or pale sand martin, is a small member of the swallow family found in open habitats such as farmland, grassland and savannah, usually near water. It is found from Central Asia to south-eastern China, and was formerly considered a subspecies of the sand martin (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It gives no plumage, size, diet or breeding information, and does not name Bhutan, so none is stated.