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Message: <blockquote data-quote="SteveMM" data-source="post: 3241028" data-attributes="member: 130392">Some info that I found on Uniform (Island) Swiftlet Aerodramus vanikorensis here:<a href="http://birdphotoph.proboards.com/thread/6730" target="_blank">http://birdphotoph.proboards.com/thread/6730</a>And some thoughts: To my eye, these birds seem to have a fairly distinct breast band, with upper- and centre-breast obviously darker than clearly whiter throat. They also seem to get progressively darker towards the vent, with the darkest area below being towards the 'rear' of the underparts. On the form that occurs on Taiwan, the reverse is true, as birds get noticeably paler towards the vent.In the sharpest of photos, the white chin and upper throat can be seen to be distinctly streaked. In my experience, this is unlike the swiftlet that occurs in Taiwan, which typically shows a chin which is slightly darker than the upper breast and not streaked.I don't think that discussion of tail forks is at all useful given that this will vary due to wear and moult (both shed and growing feathers). Also, there are no photos of the upperside of these Philippine birds, so we're only seeing half of the bird. That said, I think Uniform Swiftlet can be ruled out for most Taiwan records on underpart colouration, but read with interest that they will disperse widely over northern Luzon in flocks of thousands following adverse weather!</blockquote>