On high with swiftlets

 Time when you spin, and spin, and spin, all for the sake of the swiftlets.

And once upon a time, I would have walked on without even attempting to take on these tiny perpetually air-borne ones (though they are comparatively medium-sized), yet due regard must be extended!

And these had appeared in flocks again, and highly likely were Germain's Swiftlets (Aerodramus germani) going by the deeper tail-fork, paler underparts and paler rump.