How is the Willow Warbler's song characterized in contrast to the Chiffchaff's abrupt call?
Answer
A simple, repetitive descending whistle
When visual identification is difficult, song provides the most reliable confirmation, especially when distinguishing the Willow Warbler from the closely related Chiffchaff. The Willow Warbler's song is described as a simple, repetitive descending whistle, often characterized as soft and lilting, seeming to slip quietly down the musical scale. This gentle, falling quality provides a clear contrast to the Chiffchaff’s call, which is described as monosyllabic and abrupt, often transcribed as ‘hweet’.
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