What reliable field mark is present on the wing of both male and female Whinchats?
Answer
A conspicuous white patch on the wing
A critical identifying feature that aids in distinguishing the Whinchat from similar species, irrespective of the bird's sex, is a prominent marking on its wings. This feature is described as a conspicuous white patch. When the bird is observed taking flight, this patch flashes brightly, functioning almost like a signal flag that catches the eye against the background environment, making it a highly dependable field mark for identification.
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