
Photo: (c) Tomas Broucek, some rights reserved (CC BY) · CC BY 4.0 (May be cropped or resized)
Phylloscopus collybita
Habitat
Open woodlands; female builds a domed nest on or near the ground
Range
Breeds throughout northern and temperate Europe and the Palearctic; winters in southern and western Europe, southern Asia and north Africa
Incubation period
13–14 days by the female; chicks fledge after another 14–15 days
The common chiffchaff is a common and widespread leaf warbler that breeds in open woodlands throughout northern and temperate Europe and the Palearctic. It is greenish brown above and off-white below, named onomatopoeically for its simple 'chiff-chaff' song, with dark legs, a fine dark bill and a short whitish supercilium (Wikipedia, general species account).
It is migratory, wintering in southern and western Europe, southern Asia and north Africa. The female builds a domed nest on or near the ground and incubates for 13 to 14 days; she broods and feeds the chicks for another 14 to 15 days until they fledge, while the male defends the territory and attacks predators. The account opened does not name Bhutan.