Structurally, how does the primary projection of the Willow Warbler compare to the Chiffchaff?
Answer
Willow Warbler has noticeably longer primary projection extending past the tertials
The Willow Warbler has noticeably longer primary projection, where the primary tips usually extend noticeably past the tertials, often by as much as the length of the tertial feather itself, while the Chiffchaff's projection is much shorter.
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Chiffchaff vs Willow Warbler. How To Tell The Difference. - YouTube
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