Red-footed Falcons differ significantly in appearance between females and males.
While the male (1st, 4th & 5th photo) is a rich dark blue-gray, the female (2nd & 3rd photo) is primarily rust-brown with blue-gray feathers.
Immature birds have a streaked breast.

1st, 2nd & 3rd photo: Psili Ammos, Samos, Greece, 3 May 2025
4th & 5th photo: Lake Kerkini, Greece, 16 April 2016