What phrase transcription is often used to represent the Willow Warbler's song?

Answer

Hoo-ee, hoo-ee, hoo-ee

The Willow Warbler's song is sometimes transcribed as 'hoo-ee, hoo-ee, hoo-ee' or described as a more elaborate descending trill, contrasting with the Chiffchaff’s call.

What phrase transcription is often used to represent the Willow Warbler's song?
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