Date: 9/28/25 3:55 am From: Ian MacGregor <00000489141846bd-dmarc-request...> Subject: Re: Vireo Variability
I decided to change the observation in EBird from Philadelphia to vireo sp with the following details
Siz e and shape of a Warbling. Bright yellow throat and softer yellow underparts suggesting
Philadelphia. Black vireo type bill smallish but definitively so. No eye ring, Supercilium strong ,more like a Warbling. Lores not obviously dark, perhaps a smudge. Crown darker than on Eastern Warbling Vireo
Originally identified as Philadelphia due to underparts coloration, especially bright yellow throat. How ever uncertainty about the lores raising doubts
On Sat, Sep 27, 2025 at 9:16 PM, Ian MacGregor <[<ianmacg...>](mailto:On Sat, Sep 27, 2025 at 9:16 PM, Ian MacGregor <<a href=)> wrote:
> I was at Logan Springs this morning, having arrived shortly after Doug Zollner. We took slightly different routes to avoid impeding each other, but I did talk to him as he was finishing. One of the birds he mentioned was Warbling Vireo. I was only a few minutes into the wooded section. After walking the circuit, I returned to the most productive part of the preserve. A fairly open area with shrubs and small trees in old fishery ponds.
>
> A warbler appeared, extensively yellow below, but more intensivelfy soon the throat. A female Common Yellowthroat. Then another bird appeared its much the same pattern, but this was a Vireo. Okay I thought, Warbling or Philadelphia. The bird was quite yellow below and definitely had a bright yellow throat. I remember studying the crown color of Warbling Vireos at Siloam Lake, this bird’s
> crown was definitely darker. The bird was extremely cooperative. It stayed for over a minute in a tree a few yards away and just above eye level. It then flew a few feet a repeated the performance. I could not however find the bird with the camera.
>
> The bird sounds like a perfect Philadelphia Vireo, but when I looked at the lores, I saw no obvious markings, I had a long time to look and thought I detected a smudge , but that could of been wishful thinking.
>
> The darker crown, and bright yellow throat, made me think it had to be a Philadelphia. I looked at pictures of Philadelphia and the dark lores are not always apparent. I thought the bird was small-billed. It was not noticeably smaller than a Warbling when perched, but seem so in flight.
>
> Can Warbling Vireos ever have a bright yellow throat?
>
> Ian MacGregor Bella Vista
