How is the Willow Warbler's song commonly described?
Answer
A melodious, flowing, descending, liquid whistle
The Willow Warbler possesses a distinctly melodious, flowing song, often described as a gentle cascade of notes that trails off, contrasting with the Chiffchaff's simpler repetition.

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