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Photo: Forest Botial-Jarvis · CC BY 4.0 (May be cropped or resized)
Aerodramus vulcanorum
Size
13–14cm
The volcano swiftlet was formerly considered conspecific with the Himalayan swiftlet. It is 13–14 cm long and dark grey with a conspicuous brown rump band, which is less defined in young birds. It is easily heard thanks to a distinctive clicking call. Nothing is known about its diet (Wikipedia, general species account).