How do the males of the eastern subspecies *E. c. erythrogenys* generally differ from the nominate *E. c. citrinella* form?
Answer
They are paler, less heavily streaked, and have brighter yellow crowns and throats
Males belonging to the eastern subspecies, *E. c. erythrogenys*, exhibit several distinctions when compared to the European nominate form, *E. c. citrinella*. The eastern males are characterized as being generally paler overall and possessing less heavy streaking on their plumage. Furthermore, their undertail and wing bars are typically whiter than those of the nominate subspecies, and perhaps most noticeably, their crowns and throats display a brighter yellow hue. This subspecies occupies the eastern range, stretching from Russia and central Ukraine into Siberia and northwestern Mongolia.
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