Angola Swallow
Hirundo angolensis
They measure 15 cm and weigh 16 to 19 g. The plumage of the forehead, throat and upper breast is coloured deep rufous-chestnut. The crown and upperparts are a shiny steel-blue. Flight and tail feathers are black, the latter with large white windows.
ID text from Wikipedia, CC BY-SA 4.0
Pearl-breasted Swallow
Hirundo dimidiata
The pearl-breasted swallow is 13–14 cm long. It has glossy blue upperparts and grey-white underparts. The upper wings, underwing flight feathers and forked tail are blackish-blue. The underwing coverts are a darker shade of grey-white. The lack of white in the tail is a distinction from similar Hirundo species. The outer feathers are slightly longer in the male than the female. Juveniles are duller and browner than the adult, with shorter outer tail feathers. The northern subspecies, H. d. marwitzi is darker and smaller than nominate H. d.
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: Angola Swallow and Pearl-breasted Swallow.