Dusky Woodswallow
Artamus cyanopterus
The dusky woodswallow is medium-sized and swallow-like, with a dark brown hue, but there have been instances where the bird has appeared grey. The birds have a black patch in front of the eyes, and grey (sometimes also black) wings with white streaks on them. The dusky woodswallow has a black, white-tipped tail with a silver underwing. The birds have a blue-grey bill capped with black. Dusky woodswallows are known to spontaneously 'wag' or swivel their tails fervently, a trait which is common among many other species of woodswallow.
ID text from Wikipedia, CC BY-SA 4.0
White-breasted Woodswallow
Artamus leucorynchus
The white-breasted woodswallow's plumage is dark grey on the head and neck, with white underparts, giving the species its common and scientific names, in contrast to the related great woodswallow whose upper side is a more glossy black. The stout bill is bluish-grey with a black tip. They can also be identified by their short, black tail and grey feet. Their completely black tail makes them the only woodswallow lacking white on the tail. Males and females are identical in appearance. Juveniles have a more brownish plumage around their head and mantle that is usually heavily striated.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Dusky Woodswallow and White-breasted Woodswallow.