Re: [cobirds] AOU has split Warbling Vireo

In the Fall 2023 issue of Colorado Birds, I discussed this very topic in my column on Birding By Ear. Unfortunately we'll have to wait until next spring before we can again practice separating the two species in the field, but indeed we in the Front Range live in a transition zone between them. I'm thrilled that through this split, more attention will be brought to these lovely songsters who in some locations are remarkably abundant!

Eric

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Eric DeFonso
Boulder County, CO

On Thu, Aug 14, 2025 at 9:04 AM Peter Ruprecht <pruprecht@gmail.com> wrote:

Just anecdotally, I have heard both songs within 100m of each other at Walden Ponds in E. Boulder County. So it seems like there's some range overlap.

I guess this situation is a reason why I should do a better job of documenting subspecies when they are clearly differentiable.

Peter Ruprecht

Superior

On Thu, Aug 14, 2025 at 8:22 AM Brandon <flammowl17@gmail.com> wrote:

We now have two species of Warbling Vireos.  Eastern Warbling-Vireo and Western Warbling-Vireo both breed here in Colorado.  The songs are different.  I know the birds I have breeding up here in Custer County in Aspen trees are western, what about the breeding birds at Lake Pueblo State Park in Cottonwood trees?  Just trying to figure out how far West the eastern ones are.  I am pretty sure they are all easterns that breed in Otero, Bent, Prowers, along the Arkansas River in SE Colorado.

Thanks for any info on their range in Colorado.

Brandon Percival
Pueblo West, CO

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