Amur Falcon
Falco amurensis
Males are characteristically dark sooty grey above with rufous thighs and vent. In flight, the wing lining is white, contrasting with the dark wing feathers. Adult males of the closely related red-footed falcon have a dark grey wing lining. In Africa, males can be confused with melanistic Gabar goshawks, but the chestnut on the vent is distinctive. Also, there may be some superficial resemblance to the sooty falcon and the grey kestrel, but those two species both have yellow feet and cere.
ID text from Wikipedia, CC BY-SA 4.0
Red-footed Falcon
Falco vespertinus
It is a medium-small, long-winged species. The adult male is all blue-grey, except for his red undertail and legs; its underwings are uniformly grey. The female has a grey back and wings, orange head and underparts, and a white face with black eye stripe and moustaches. Young birds are brown above and buff below with dark streaks, and a face pattern like the female. Red-footed falcons are 28–34 cm (11–13 in) in length with a wingspan of 65–75 cm (26–30 in). The average mass is 155 g (5.5 oz).
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: Amur Falcon and Red-footed Falcon.