Identification
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A grayish-brown swiftlet, paler beneath, darker above with a faintly bluish tinge, with a variably grayish rump. Very poorly known from a few specimens and field observations. Generally occurs between 900-1200 meters of elevation, but has been seen at sea level. Very similar to White-rumped Swift, but has a darker gray rump and is much larger. Vocally unknown.
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