
Photo: (c) Rejoice Gassah, some rights reserved (CC BY) · CC-BY (May be cropped or resized)
Arundinax aedon
Diet
Insects, and other small prey items
Habitat
Nest in a low tree
Range
Breeds in the temperate east Palearctic, from south Siberia to west Mongolia; winters in tropical South and South-east Asia
Clutch size
5–6 eggs
Size
16–17.5cm
The thick-billed warbler breeds in the temperate east Palearctic, from south Siberia to west Mongolia, and is migratory, wintering in tropical South and South-east Asia. It is a large warbler, 16 to 17.5cm long, nearly as big as the great reed warbler, with a rounded forehead and a short, pointed bill. The adult has an unstreaked brown back and buff underparts with few distinctive features (Wikipedia, general species account).
Five or six eggs are laid in a nest in a low tree. Like most warblers it is insectivorous but will take other small prey. The song is fast and loud and similar to the marsh warbler's, with much mimicry. The account opened does not name Bhutan, so its occurrence there is flagged for checking.