In Western Europe, Chiffchaffs are often found deep within which type of cover?
Answer
Dense hedgerows or thickets
While both species can be present during migration, Chiffchaffs are often quite happy deep within dense hedgerows or thickets, whereas Willow Warblers prefer slightly more open habitats.

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