Crested Treeswift
Hemiprocne coronata
The crested treeswift is a large slender bird at 23 cm (9 in) length. This species is dove grey above and white below. The long swept-back wings are a darker grey above. This treeswift has a crest and a long, deeply forked tail. The adult male has orange cheeks and ear coverts with a narrow streak of white under the eye and a trace of a white supercilium. The female also has a thin white stripe below the eye running below the grey cheek and ear coverts.
ID text from Wikipedia, CC BY-SA 4.0
Grey-rumped Treeswift
Hemiprocne longipennis
Adult males have a distinct dark grey throat and chest contrasting with a white belly. Ear coverts are dull orange-red/chestnut-colored. Adult females lack the dull orange-red/chestnut coloration on the ear coverts. When perched, the wing tips cross over across the tail. Both sexes have a greenish sheen to the upper parts.
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: Crested Treeswift and Grey-rumped Treeswift.