Tuesday, 15 September 2026

[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 9/14/26

Today was really windy at the station area, but down below, just a few feet lower where the nets are, it was calm and cool, and there were plenty of birds.  We again caught a good number of Wilson's Warbler (a mix of hatch years and adults) and the Yellow-rumped Warblers started to show up in numbers.  A nice surprise was a hatch year Blackpoll Warbler, a species rarely caught at this station.  Here's the breakdown of today's 93 new birds. (I'm trying to stay cool; these numbers are pretty extraordinary for us!):

Downy Woodpecker 1
Western Wood-pewee 1
Hammond's Flycatcher 1
Dusky Flycatcher 2
Western Flycatcher 1
Cassin's Vireo 1
Red-breasted Nuthatch 2
Northern House Wren 2
Ruby-crowned Kinglet 1
Swainson's Thrush 1
Gray Catbird 5
Orange-crowned Warbler 9
Yellow-rumped Warbler 12
Blackpoll Warbler 1
Wilson's Warbler 46
Western Tanager 1
Chipping Sparrow 1
Clay-colored Sparrow 1
White-crowned Sparrow, Gambel's 2
Dark-eyed Junco, Oregon 1
Lazuli Bunting 1

We are open Tuesday through Sunday, weather permitting, through October 23.  Most weekday mornings there is a visitor session from 7:30 to 8:30, and on the weekends there are sessions at 8, 9 and 10 a.m.  Reservations are needed; here is the link.   Please join us......It is a great year to visit Barr!

Meredith McBurney
Bander, Barr Lake Station
Bird Conservancy of the Rockies

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[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (15 Sep 2026) 62 Raptors

Mount Zion Hawk Watch at Windy Saddle Park
Golden, Greater Denver, Colorado, USA

To see hourly weather data and details of migrant raptors, look up this watch at hawkcount.org. This is a new raptor migration site identified and designated in mid-September 2024. This is Colorado's 1st fall hawk watch site, and the second hawk watch in Colorado. To get to the site which is along Lookout Mountain Rd. in Golden, enter either Windy Saddle Park or Mount Zion into Google Maps on your favorite navigation app, or enter the coordinates 39.7368,-105.2454. From the parking lot ascend the stone steps to the watch site. EVERYONE IS WELCOME TO THE HAWK WATCH TO ENJOY THE SPECTACLE OF RAPTOR MIGRATION, EVEN IF YOU KNOW NOTHING ABOUT IDENTIFYING RAPTORS IN FLIGHT. We will help you to learn Raptor ID if you are interested. See https://groups.google.com/g/cobirds/c/Oznn4uc6MBk

Daily Raptor Counts: Sep 15, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 3 75 180
Osprey 0 16 18
Bald Eagle 0 1 2
Northern Harrier 0 1 2
Sharp-shinned Hawk 0 2 5
Cooper's Hawk 3 42 56
American Goshawk 0 0 0
Broad-winged Hawk 4 18 18
Red-tailed Hawk 5 159 316
Rough-legged Hawk 0 0 0
Swainson's Hawk 44 114 129
Ferruginous Hawk 0 1 1
Golden Eagle 0 1 2
American Kestrel 3 50 70
Merlin 0 0 0
Peregrine Falcon 0 0 1
Prairie Falcon 0 0 1
Mississippi Kite 0 0 0
Unknown Accipitrine 0 2 2
Unknown Buteo 0 0 1
Unknown Falcon 0 0 0
Unknown Eagle 0 0 0
Unknown Raptor 0 1 2
Total: 62 483 806


Observation start time: 08:30:00
Observation end time: 14:30:00
Total observation time: 6 hours
Official Counter Ajit Antony
Observers: Liza Antony



Visitors:
4 hikers were interested and asked questions. A young man carrying binoculars asked if this was the hawk watch, and when I said Yes, I asked what the binoculars were for, he said he likes to watch birds, and promptly left! Other comments were Very cool, I love that from a young woman who asked about what I was looking at, then wanted to know how many hawks I had seen, and when I had started counting this morning.

Weather:
A strong cold front had gone through the night before and yet Denver was so hazy I could only see it because I knew where it was, because of a cold inversion layer trapping atmospheric pollutants and fine dust particles carried by the front. Chilly, very pleasant air. Cirrus clouds to the East and cumulus developing from the West moving East.

Raptor Observations:
I was wondering whether a cold front would bring any raptors here in the west compared to New York, initially the answer seemed No but by the end of the day it was a resounding Yes. Very peculiar migration in that the first half hour had no migrants, a big flurry of 12 migrants in the next hour, the first being a BW at 10:05 a.m. MDT. The next hour had only 2 migrants, the hour after only 1, the 1:00 hour had streaming SW, a trio of an adult with two juveniles, then followed by a stream of 26, followed by 6 followed by 2 and then two singles, all in a new channel we've never had migrants fly through before - high 35� North going to the SE through a perfectly blue sky, the only reason I could find them was as they went SE there was a large cloud I could see them against, and the ones following I could track in a blue sky knowing where they might have been. Non-migrant raptors: RT 2, TV 6.

Non-raptor Observations:
WEBL 1, STJA 1, BTHU 1, GHJU 3, VGSW 5, ROPI 11, WBNU 1 Eastern subspecies heard, RBNU 1, WTSW 10, BBMA 1, YRWA 1, BGGN 1, TOSO 1, NOFL 1. 2 paragliders at 10:00 a.m. had no lift, and of 4 after 11:30 a.m., 2 had moderate lift and 2 had none. The Soaring Forecast from the NWS predicted poor lift at only 3 ft per second and the height of thermals only 5,014 ft AGL - lower than the watch, though the large count of raptors including the SW were at level 4 and level 5 (at the limit of 10x binoculars) height of flight - certainly much much higher than predicted.

Predictions:
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high. Winds aloft are predicted to be from the SW changing to East, by Earth.nullschool.net


Report submitted by Ajit Antony (aiantony@earthlink.net)
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]




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FW: [cobirds] Re: Late nesting barn swallows

I intended this to go to Mr. Killam plus the entire COBIRDS clan.

Dave

 

From: DAVID A LEATHERMAN
Sent: Tuesday, September 15, 2026 1:55 PM
To: 'wmrki...@gmail.com' <wmrkillam69@gmail.com>
Subject: RE: [cobirds] Re: Late nesting barn swallows

 

The discussion of late Barn Swallow fledging initially brought up by Scott, the interesting question by Nathan about what constitutes “fledging” and the various other reports of late BASW activity has been very interesting.  It is exactly what COBIRDS is better at than eBird and I hope both communication outlets continue to thrive.  I have no doubts regarding eBird but sometimes COBIRDS feels threatened and endangered.

 

The two Barn Swallow situations I mentioned in Fort Collins essentially came to an end yesterday. 

 

On 9/14 I visited Sheldon Lake in City Park (just north of Mountain Avenue west of Shields) and during late morning a flock of about 45 fledglings and adults sat on boat ramp wires loudly discussing impending travel plans.  When I visited in late afternoon, they were gone.  Today I saw a few BASW up high over the lake that I suspect were migrants from points north.

 

The nest under the Grandview Cemetery entrance bridge spanning the New Mercer Ditch was completely abandoned as of September 14.  I think some of the last activity of adults flying in to feed young during the period of September 11-13 might well have been Nathan’s “teenagers with driver’s licenses still living at home” scenario.  I bet there are a lot of human parents that wished this phenomenon only lasted a max of a couple days/weeks. 

 

Safe travels to our beautiful fork-tailed, West Nile mosquito-eating friends.

 

Dave Leatherman

Fort Collins

 

From: cobirds@googlegroups.com <cobirds@googlegroups.com> On Behalf Of wmrki...@gmail.com
Sent: Tuesday, September 15, 2026 10:44 AM
To: Colorado Birds <cobirds@googlegroups.com>
Subject: [cobirds] Re: Late nesting barn swallows

 

And yesterday, September 14, I noted numerous barn swallow fledglings and adults on the power lines along the west side of Lakeside Amusement Park.

On Monday, September 14, 2026 at 3:28:55PM UTC-6 Betsy Rumely wrote:

Parking garage — Denver Botanic Gardens , 9/2/26

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[cobirds] Chico Basin Ranch Banding Station Report-Bird Conservancy of the Rockies-September 15, 2026

A northerly wind which was breezy early on but reduced its strength by mid-morning. There was a group of species around today. They were just hard to see in the fluttering leaves. Eighteen bird species were banded/handled today and released including another Great-crested Flycatcher and a Common Yellowthroat. Flycatchers were fairly prolific as well. A Brown Thrasher returned to the olive grove which was banded in fall of 2023 as and adult. It is at least 5 years old. 
47 New Banded Birds
Wilson's Warbler- 15
Common Yellowthroat- 1
Dusky flycatcher- 4
Hammond's Flycatcher- 2
Great-crested Flycatcher- 1
Red-breasted Nuthatch- 1
Ruby-crowned Kinglet- 2
Chipping Sparrow- 1
Lincoln's Sparrow- 8
House Finch- 2
Blue Grosbeak- 1
Gambel's White-crowned Sparrow- 3
Green-tailed Towhee- 1
Spotted Towhee- 1
Yellow-breasted Chat- 1
Swainson's Thrush- 1
Townsend's Solitaire- 2

1 Return- bird banded in a previous year and recaptured again
Brown Thrasher - banded as an adult in August 2023

The Banding station will be open tomorrow through Saturday from sunrise until @ 11:45AM. 
If interested in visiting the Ranch, Please register online at www.aikenaudubon.com.
Enjoy the nice fall day!

Julie Shieldcastle, Bander
Chico Basin Ranch
Bird conservancy of the Rockies

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[cobirds] Re: Late nesting barn swallows

And yesterday, September 14, I noted numerous barn swallow fledglings and adults on the power lines along the west side of Lakeside Amusement Park.

On Monday, September 14, 2026 at 3:28:55 PM UTC-6 Betsy Rumely wrote:
Parking garage — Denver Botanic Gardens , 9/2/26

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Re: [cobirds] Empid help - Arapahoe

Hey Jared,

You're correct, for the reasons you stated about Hammond's being in a fresh, yellowish plumage this time of year. In fact, they're so much so that often a stronger source of confusion right now is Western Flycatcher. But the small, all-dark bill and the long, thin sabre-like primary projection are good Hammond's cues. Not just the length, but the thin shape of those primaries with a noticeable gap between the 3rd and the 4th longest visible primary feathers.


David Tønnessen 


On Tue, Sep 15, 2026, 9:25 AM Jared Del Rosso <jared.delrosso@gmail.com> wrote:
Had a tough empid in my Centennial yard last night. Everything--bill, primary extension, tail length, at least at variable angles of photos--seems intermediate between a Hammond's and Dusky, but I have very little experience with Hammond's. (One experience, to be precise.) A Hammond's would rate as a "good" yard bird here in Centennial. A Dusky would be, well, another Dusky, though any empid visit to a suburban yard is exciting.

The freshness and brightness of the plumage seems a good sign of a Hammond's, which molt before fall migration and are in, according to Kenn Kaufman, "very fresh plumage during fall migration, with buffy wing bars, fairly bright yellow on the belly and dark olive-gray on the chest" (but note I have no chest photos). But the paleness of the throat and the olive-green on the head seem a strike against it (to my inexperienced eyes). 

Duskies don't molt until arriving on wintering grounds. Kaufman describes adults as "worn and drab" in fall; juveniles are "slightly more colorful...but these colors are fading rapidly as the late summer turns to fall."

The bill color seems closer to Hammond's to me -- mostly dark, but this seems to depend on the angle and clarity of the photo and seems fairly variable among birds anyway.

Photos below. 

Screenshot 2026-09-14 at 8.09.30 PM.png
This photo gives me Hammond's vibes -- but are the primaries long enough? Certainly, the tail doesn't seem long to me. (I saw a Dusky in my yard a week or so ago, and the tail seemed much longer?) Bill looks small, no? Or is that the angle?

Screenshot 2026-09-15 at 9.03.03 AM.png
Clear shot of the primary extension. Seem neither long nor short. Same goes for the tail. A lot of olive-yellow, though.

I have a several more photos, but they're all mostly variants of these.

Any help and input appreciated!

- Jared Del Rosso
Centennial, CO

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[cobirds] Empid help - Arapahoe

Had a tough empid in my Centennial yard last night. Everything--bill, primary extension, tail length, at least at variable angles of photos--seems intermediate between a Hammond's and Dusky, but I have very little experience with Hammond's. (One experience, to be precise.) A Hammond's would rate as a "good" yard bird here in Centennial. A Dusky would be, well, another Dusky, though any empid visit to a suburban yard is exciting.

The freshness and brightness of the plumage seems a good sign of a Hammond's, which molt before fall migration and are in, according to Kenn Kaufman, "very fresh plumage during fall migration, with buffy wing bars, fairly bright yellow on the belly and dark olive-gray on the chest" (but note I have no chest photos). But the paleness of the throat and the olive-green on the head seem a strike against it (to my inexperienced eyes). 

Duskies don't molt until arriving on wintering grounds. Kaufman describes adults as "worn and drab" in fall; juveniles are "slightly more colorful...but these colors are fading rapidly as the late summer turns to fall."

The bill color seems closer to Hammond's to me -- mostly dark, but this seems to depend on the angle and clarity of the photo and seems fairly variable among birds anyway.

Photos below. 

Screenshot 2026-09-14 at 8.09.30 PM.png
This photo gives me Hammond's vibes -- but are the primaries long enough? Certainly, the tail doesn't seem long to me. (I saw a Dusky in my yard a week or so ago, and the tail seemed much longer?) Bill looks small, no? Or is that the angle?

Screenshot 2026-09-15 at 9.03.03 AM.png
Clear shot of the primary extension. Seem neither long nor short. Same goes for the tail. A lot of olive-yellow, though.

I have a several more photos, but they're all mostly variants of these.

Any help and input appreciated!

- Jared Del Rosso
Centennial, CO

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