I went to the warbler hotspot this morning ~730 am but only had about 15 minutes so I only covered the area west of 17th street Bridge. I had a cluster of Bushtits, pair of BCCs, and pair of WBNUs near the bridge where the warblers had been spending a lot of time. This morning there was 2-3 inches of snow and it was lightly snowing, compared to later in the morning/day with near blizzard like conditions -- I couldn't see the Flatirons from my office on Pearl Street.
Unfortunately I didn't have time for a thorough search of the area, so it's entirely possible they'll endure the storm and hang around just so they can be observed on the CBCs. (fingers crossed)
Checklist from this morning:
Also along the lines of David's notes on what are they eating -- here are a few photos of the Orange-crowned gleaning aphids from a few weeks ago:
I believe this spot along Boulder Creek/CU campus is a pretty common migrant trap for warblers, so while rare/out of range, perhaps, certainly handfuls come through this spot each year, inclusive of prior years with multiple interesting warbler species in the same tree at the same time or so I'm told.
In flipping through the BoCo bar charts for warblers, it is interesting to look at excluding 2025 (screen shot with red circles) vs including 2025 (screen shot with blue circles). The Orange-crowned,perhaps just late. The Northern Parula, Pine Warbler, and Nashville maybe should be somewhat expected, with Chestnut and Tennessee being the rarer birds. Of course, as cooperative as these have been, all 6 species now have a more prominent bump up in the bar charts for November.
There is no bad weather for birding, only bad gear.
Good birding,
Jeff Percell
Erie, CO
On Wed, Dec 3, 2025 at 1:07 PM Brandon <flammowl17@gmail.com> wrote:
It is amazing the species of warblers that have been seen in Colorado during the winter months (December to February). I wonder how many species of warblers will be found on Colorado Christmas Bird Counts this winter. I know one year, the Pueblo Reservoir CBC found five species of warblers on count day (Yellow-rumped, Yellow-throated, Prairie, Chestnut-sided and Northern Parula, that's our record). Boulder might have a chance to beat that. We have had several other warbler species on the Pueblo Reservoir CBC during the 50 year history of the count, including Black-and-white (last year), Orange-crowned, Nashville, Pine, Cape May, Black-throated Green, Northern Yellow, Common Yellowthroat, also Yellow Palm and MacGillivray's during count week. I know other warbler species have been in Pueblo in the winter, though not seen on the Pueblo Reservoir CBC, like Tennessee, Wilson's, Black-throated Blue, and the January 1st, 2025 Bay-breasted Warbler.Christmas Bird Counts begin in just 11 days, good luck to everyone who is helping with the 50ish Colorado Bird Counts from 14 December to January 5.Brandon K Percival
--On Wed, Dec 3, 2025, 12:48 PM 'John Malenich' via Colorado Birds <cobirds@googlegroups.com> wrote:--Thank you Dave for your excellent response! I always love reading your posts and articles and always learn a great deal from them!John MalenichBoulder, CO
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