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Photo: Wich'yanan L (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Cyanoptila cumatilis
Range
Breeds in central China; winters south to the Malay Peninsula, Sumatra and Java
Zappey's flycatcher is an Old World flycatcher that is migratory, breeding in central China from central Sichuan north-east to the mountains west of Beijing and wintering south to the Malay Peninsula, Sumatra and Java. It is closely similar to, and was formerly considered conspecific with, the blue-and-white flycatcher, which breeds further east (Wikipedia, general species account).