Am besten gelingt die Unterscheidung anhand des Gesangs :
Jener des Fitis klingt schwermütig flötend.
www.vogelwarte.chThey are best distinguished by their song :
The Willow Warbler's song sounds mournfully fluting.
www.vogelwarte.chFacts
The Willow Warbler and the Common Chiffchaff are so-called sibling species and look very similar.
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