The Institute for Bird Population Studies recently posted a series of recordings of the song of the “Thick-billed” Fox Sparrow.  Some of the recordings they describe as being different sound remarkable similar to me, I guess I lack the trained ear of the researcher. One note I found interesting is that the Thick-billed Fox Sparrow will include segments of the songs of other species in its own song, something other Fox Sparrow subspecies seldom do.

Visit the Institutes web site to hear multiple recordings and review their research.

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