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Photo: plains-wanderer · CC BY 4.0 (May be cropped or resized)
Leucoptilon concretum
Also known as: Cyornis concretus
Habitat
Submontane forest
Range
Eastern Himalayas and northern Myanmar to southern China, western and southern Thailand, the Malay Peninsula, Sumatra and Borneo
The white-tailed flycatcher is the only member of its genus, found in submontane forest from the eastern Himalayas and northern Myanmar to southern China, western and southern Thailand, the Malay Peninsula, Sumatra and Borneo (Wikipedia, general species account).