White-rumped Swallow
Tachycineta leucorrhoa
The white-rumped swallow measures 13 centimetres (5.1 in) in length and weighs 17–21 grams (0.60–0.74 oz). It has an average wingspan of 115.7 millimetres (4.56 in). It has a white supraloral streak, a white streak above its eye, and black lores and ear coverts. The lores and ear-coverts have a blue-green gloss. It has black wings, with white tips on its inner secondaries, tertials, and greater wing-coverts. The white tips erode with age. The tail is black and has a shallow fork. The white-rumped swallow also has, as the name implies, a white rump.
ID text from Wikipedia, CC BY-SA 4.0
White-winged Swallow
Tachycineta albiventer
The adult white-winged swallow is 14 cm (5.5 in) long and weighs 14–17 g (0.49–0.60 oz). It has iridescent blue-green upperparts, white underparts and rump, and white edgings to the secondary flight feathers. The wings are otherwise black, along with the tail. It has dark brown eyes and a black bill and legs. The sexes are similar, although it is noted that the females have slightly less white on the wing. Juveniles have grayer underparts and are duller in general when compared to the adults. The juvenile also has less white on the wing.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
Learn this pair in the BeakBrain App
Photo and call practice. Coming soon to iPhone and Android.
Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: White-rumped Swallow and White-winged Swallow.