Dear Cobirders,
The damp conditions and singing boreal species enticed me to take a
walk through Warbler Woods along Boulder Creek just north of Folsom
Field this morning. I was treated to a singing Swainson's Thrush, a
Gray Catbird, many Western Tanagers and an unusual Warbler.
My first impression was Pine Warbler, but it didn't really have the
olive face pattern of Pine Warbler. It was the size of a Yellow
Warbler and had a plain yellow face, olive back and wings with two
white wing bars. The throat and chest were yellow with no streaking.
The yellow faded to white on the belly and then it had yellow
posterior to the belly and into the undertail coverts. There were no
crisp color transitions. It had the hint of a small darker streak on
the body near where the alula meets the body on the folded wing, but
that was super subtle. The bill was larger, more like a Dendroica
than a Vermivora. I didn't get a look at the tail spots. It paid no
attention to the very territorial Yellow Warblers in the area and
easily hopped across territorial boundaries at about mid level in the
trees eating those little green grubs that show up there every year
and are often consumed by the Chestnut-sided Warblers I've seen here
in years past.
This Warbler was located on the south side of the creek at the middle
bridge (the one with the new stairs!)
Cheers,
Walter Szeliga
Boulder, CO
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