How is the Willow Warbler's song characterized in contrast to the Chiffchaff's call?
Answer
A clear, descending whistle
Birdwatchers often rely on vocalizations to distinguish the Willow Warbler from its closely related lookalike, the Chiffchaff. The Willow Warbler produces a song described as a clear, descending whistle, which tends to be more melodious. Conversely, the Chiffchaff is characterized by its much sharper, more abrupt vocalization, specifically noted as a sharp "chiff-chaff." This difference in auditory signal is a significant tool for identification, even though morphological differences like leg color might be subtle.
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