[cobirds] Unknown bird in Indian Peaks, Boulder County

Hi all,

I was birding just outside Indian Peaks Wilderness Area, near Brainard Lake, and had 4 robin-sized birds with grayish breasts fly over and land in a nearby tree. I was able to get an audio of a call that they were making (attached, admittedly poor quality, sorry) and Merlin couldn't figure it out. I checked birds that fit the geography, size, and color, but found none with a call like this. I checked Townsend Solitaire, Pine Grosbeak (although the bills were more thrush than grosbeak), Olive-Sided Flycatcher (not gray, but...), and even Mountain Bluebird (maybe they were all juveniles?), but none of these have a call that is even close.

Any insights from the experts?

Thanks,

Van Rudd

Louisville, CO

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