Appearance
The plume-toed swiftlet is 9–10 cm in length with a square tail. The back and upper surface of the wings are uniformly dark greenish-blue with a moderate gloss. The throat and upper breast are dark grey merging into large greyish chevrons over the lower breast and flanks, usually becoming white over the belly. There is a tuft of small feathers on the hallux, the rear facing toe. This species lacks a pale contrasting rump and has no white spots on the inner webs of the tail feathers.References:
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