A Cerulean-like song variant of Black-throated Blue Warbler

This recording includes one song of Cerulean Warbler and one of Black-throated Blue Warbler. Can you tell them apart? Distinguishing Black-throated Blue Warbler and Cerulean Warbler by song is usually not too difficult, even though both have buzzy songs with a more or less rising trend. The typical songs of both species are distinctive, and …

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