Fantastic photos Kinni! Great detail.
They show one thing about Himalayan Swiftlet photos that I've noticed from my own rather less good photos.
Compare the first photo, where the background is darker, with the last photo where the background is light. The bird appears to be much darker on the rump and undertail in the first photo than in the others.
This is important because it has been suggested that rump colour can be used to separate Himalayan from Germain's Swiftlet, which could occur in Hong Kong and has a paler rump. But from my experience and as shown here, rump colour on swiflets can vary a lot according to light conditions so I don't think it can be used to separate Swiftlet species.
For me, only the birds themselves know what species they are, and they're not telling.
[ Last edited by wgeoff at 17/10/2015 13:02 ]
