Where do Willow Warblers generally breed compared to Chiffchaffs?
Answer
Willow Warblers are generally birds of the north and west, breeding further north and west across Eurasia
Willow Warblers breed further north and west across Eurasia, while the Chiffchaff is more widespread across the central and southern areas.

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Chiffchaff vs Willow Warbler. How To Tell The Difference. - YouTube
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