» Comments from Dick Forsman on this image:
"(This bird) is a first-winter (immature) male Amur. However, it has to be said, that this plumage is the most similar of all plumages between the two species (Amur and Western Red-footed Falcon). Western Red-foot (1st winter male) has an identical plumage-type, and the differences are very few. The most reliable ones are: The new central tail-feathers are grey on Amur, but darker, almost black on WRF and, the retained juvenile underwing coverts are practically black-and-white on Amur, while WRF has more buffy coverts with brown markings (less contrasting pattern)."
Many thanks Dick!