Thursday, 17 September 2026

[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 9/17/26

Things were slow today. Everything was down -  Wilson's still led the parade, but there were fewer of them; we banded only one flycatcher, but also only one sparrow.  The one flycatcher was an Olive-sided, a definite rarity for us.

Here are the 39 new birds:

Olive-sided Flycatcher 1
Black-capped Chickadee 1
Red-breasted Nuthatch 1
Northern House Wren 1
Gray Catbird 1
Yellow Warbler 2
Yellow-rumped Warbler, Audubon's 1
MacGillivray's Warbler 1
Common Yellowthroat 1
Wilson's Warbler 28
Green-tailed Towhee 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] Brown Thrasher at Big Dry Creek

All:
        Brown Thrasher seen at Big Dry Creek Park in Westminster this afternoon.  The bird was quiet but not shy about perching out in the open.   Also, present were two scrub jays which are uncommon at this location  

Brown Thrasher Big Dry Creek Park Westminster CO 28 signed copy.jpg

Happy birding, 
John T  


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[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (17 Sep 2026) 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 17, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 0 84 189
Osprey 0 18 20
Bald Eagle 0 1 2
Northern Harrier 0 4 5
Sharp-shinned Hawk 0 2 5
Cooper's Hawk 0 52 66
American Goshawk 0 0 0
Broad-winged Hawk 0 18 18
Red-tailed Hawk 0 173 330
Rough-legged Hawk 0 0 0
Swainson's Hawk 0 115 130
Ferruginous Hawk 0 1 1
Golden Eagle 0 1 2
American Kestrel 0 62 82
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: 0 534 857


Observation start time: 07:00:00
Observation end time: 08:15:00
Total observation time: 0 hours
Official Counter
Observers:



Visitors:
No visitors

Weather:
98% cloud cover with dark grey clouds to the west of the watch and overlying the watch. A tiny sliver of blue was seen in the sky over the far south east where Aurora is located. Brisk winds from the West with drizzle noted at the end of the first hour. I stayed for 15 minutes of the second hour when the drizzle turned to rain.

Raptor Observations:
No migrant or non- migrant raptors seen.

Non-raptor Observations:
An unseen animal made a growling sound which startled me. AMCR 1,SPTO 1, VGSW 5, WEBB 3, Flicker 1, AMRO 2, PYNU 3, MOCH 1, BBMA 1

Predictions:
A slight chance of showers before noon, then a chance of showers and thunderstorms between noon and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 63. Southwest wind around 5 mph becoming light and variable in the afternoon. Chance of precipitation is 70%.


Report submitted by Liza Antony (liza.antony15@gmail.com)
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]




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[cobirds] Chico Basin Ranch Banding Station Report-Bird Conservancy of the Rockies-September 17, 2026

What a difference a day makes! The banding olive grove was quiet today, unless you count the Red-winged Blackbirds around. Three recaptures today all increased weight by over .4 grams! That is a good amount since yesterday's banding. 
13 New Birds Banded
Wilson's Warbler- 4
Orange-crowned Warbler- 1
Hammond's Flycatcher- 1
Western Flycatcher- 1
Red-breasted Nuthatch- 1
Lincoln's Sparrow- 1
Blue Grosbeak- 1
Hermit Thrush- 1
Gray Catbird- 1
Brown Thrasher- 1

3 Recaptures
Dusky Flycatcher
Wilson's Warbler
Hermit Thrush

The banding station will be open tomorrow through Saturday at sunrise until @ 11:45AM.
If interested in visiting the ranch, please register online at www.aikenaudubon.com

Enjoy the Day!

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

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Wednesday, 16 September 2026

[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (16 Sep 2026) 51 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 16, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 9 84 189
Osprey 2 18 20
Bald Eagle 0 1 2
Northern Harrier 3 4 5
Sharp-shinned Hawk 0 2 5
Cooper's Hawk 10 52 66
American Goshawk 0 0 0
Broad-winged Hawk 0 18 18
Red-tailed Hawk 14 173 330
Rough-legged Hawk 0 0 0
Swainson's Hawk 1 115 130
Ferruginous Hawk 0 1 1
Golden Eagle 0 1 2
American Kestrel 12 62 82
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: 51 534 857


Observation start time: 08:30:00
Observation end time: 13:00:00
Total observation time: 4.5 hours
Official Counter Ajit Antony
Observers: Liza Antony



Visitors:
Aaron Lefland from Connecticut who lives near Lighthouse Point Hawk Watch and has visited there, was in Denver for a conference on Land Management, looked up eBird hotspots and found the Mount Zion Hawk Watch (which Zak Hepler had recently requested hotspot designation), so we found him at the watch when we got there, he helped us find a number of raptors, we in turn helped him learn to identify raptors in flight. He had a number of passerine lifers today.

Weather:
Less hazy over Denver then the day before, again caused by an inversion layer we could see as a brown haze to the Northeast which gradually moved South. Cool, breezy and pleasant all day, winds from the ESE changing to ENE, cloud cover 30% increasing to 85% mainly cirrus in the morning with cumulus coming in from the West as usual by the afternoon, clear visibility initially only 5 km and increasing only to 19 km.

Raptor Observations:
The first two migrants were AK along the Kestrel Channel way below us at 9:39 a.m. MDT. In addition to AK, RT (mainly local) were seen along the channel, as did all the Steller's Jay seen. At 10:46 a.m. a migrant juvenile dark morph RT promptly IDed by Liza. Non-migrant raptors: AK 2, CH 1, RT 4, TV 6.

Non-raptor Observations:
Two paragliders at 10:00 a.m. had no lift, 8 after 11:00 a.m. had none to moderate left while by 11:45 a.m. some of them were really high, barely visible to the eye. CAWR 1 calling, STJA 12, VGSW 4, WTSW 6, NOFL 1, SPTO 1, AMRO 1, AMCR 1, CORA an unkindness or conspiracy of 26, HAWO 1, BLJA 1. Because of the inversion layer, lift was very poor at 2 ft per second with the predicted maximum height of thermal 5,114 ft AGL, though the migrants were flying much much higher. As we say, they hadn't read the prediction.

Predictions:
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 78. Calm wind becoming east northeast around 6 mph in the afternoon. Chance of precipitation is 50%.


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




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[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 9/16/26

Wilson's Warblers continue coming through in record numbers; another 53 caught today.  Starting to see a higher number of sparrows mixed in with the primarily insect eaters.  Our total new birds for today was 98, but we also caught 29 recaps.  Three cheers to our volunteer team for making this system work day after day!

Here's the breakdown of the 98 new:

Mourning Dove 1
Western Wood-pewee 1
Dusky Flycatcher 1
Northern House Wren 1 new, 1 banded last year
Ruby-crowned Kinglet 1
Orange-crowned Warbler 5
Yellow-rumped Warbler, Audubon's 7
Townsend's Warbler 1
MacGillivray's Warbler 1
Common Yellowthroat 2
Wilson's Warbler 53
Green-tailed Towhee 4
Clay-colored Sparrow 3
Lincoln's Sparrow 6
Song Sparrow 2
White-crowned Sparrow, Gambel's 8

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] Chico Basin Ranch Banding Station Report-Bird Conservancy of the Rockies-September 16, 2026

You never know what birds will appear at Chico Basin Ranch. Many Lincoln's Sparrow, Green-tailed Towhees, and Wilson's Warblers around today. Fourteen bird species were captured. Mountain Academy 6th graders visited the station today. Kudos for the teachers that ask questions to make their students think about bird conservation. We definitely had lots of species to show them.
58 New Banded Birds
Wilson's Warbler- 21
Orange-crowned Warbler- 2
Dusky Flycatcher- 2
Hammond's Flycatcher- 1
N. House Wren- 1
Red-breasted Nuthatch- 1
Lincoln's Sparrow- 13
Green-tailed Towhee- 9
Hermit Thrush- 2
Western Tanager- 2
Gambel's White-crowned Sparrow- 2
Yellow-breasted Chat- 1
Spotted Towhee- 1

2 Recaptures 
American Robin
Western Tanager

The Banding station will be open tomorrow through Saturday from sunrise until @11:45AM. Please register online if interested in visiting the ranch at www.aikenaudubon.com
Enjoy the Day!

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

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[cobirds] Ridgway State Park Banding Report - Bird Conservancy of the Rockies

Apologies for the delay in getting out this message! We had a great 2 weeks in Ridgway State Park, banding a total of 161 birds of 29 species. Here were the counts for those weeks:

MacGillivray's Warbler: 22
Wilson's Warbler: 17
Yellow-Rumped Warbler (Audubon's): 14
Northern House Wren: 11
Bushtit: 10
Yellow Warbler: 10
Lincoln's Sparrow: 9
Black-Capped Chickadee: 6
Western Tanager: 5
Western Warbling-Vireo: 4
Cassin's Vireo: 4
Orange-Crowned Warbler: 4
Virginia's Warbler: 3
Gray Catbird: 3
Western Wood-Pewee: 3
Mountain Chickadee: 3
Green-Tailed Towhee: 3
Song Sparrow: 2
Spotted Towhee: 2
White-Crowned Sparrow: 2
Gray-Headed Junco: 2
Plumbeous Vireo: 1
Red-Breasted Nuthatch: 1
Brown Creeper: 1
Dusky Flycatcher: 1
Common Yellowthroat: 1
Black-Throated Gray Warbler: 1
Juniper Titmouse: 1
Nashville Warbler: 1
Steller's Jay: 1

The highlight for me was definitely the Brown Creeper, which we caught on our 7:00 run on 9/4. 

Thank you so much to everyone who came out to visit or to help out at Ridgway! We had a wonderful few weeks of birds, and we engaged tons of students. Stay tuned for our first Grand Junction tally at the end of this week!

Isabel Hardwig
Bander, Ridgway and Grand Junction Stations
Bird Conservancy of the Rockies

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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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Uploaded Image Uploaded Image

Monday, 14 September 2026

[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (14 Sep 2026) 37 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 14, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 16 72 177
Osprey 0 16 18
Bald Eagle 0 1 2
Northern Harrier 0 1 2
Sharp-shinned Hawk 0 3 6
Cooper's Hawk 1 39 53
American Goshawk 0 0 0
Broad-winged Hawk 13 13 13
Red-tailed Hawk 3 154 311
Rough-legged Hawk 0 0 0
Swainson's Hawk 0 70 85
Ferruginous Hawk 0 1 1
Golden Eagle 0 1 2
American Kestrel 4 47 67
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: 37 421 744


Observation start time: 08:30:00
Observation end time: 13:45:00
Total observation time: 5.25 hours
Official Counter Ajit Antony
Observers: Liza Antony



Visitors:
7 hikers had questions for us as to what we were looking at and only 2 of them from High Island Texas who therefore knew about birds, birders and had liked movie The Big Year. They said they would get interested in birding when they retired. I told them about a surgeon 15 years older than me who always planned to do different things including travel when he retired, and unfortunately developed metastatic kidney cancer and died at 57 years, so I recommended that if they have any interests they engage with them now. Also I know many physicians who were only interested in the practice of medicine with no other interests, consequently when they retired after a year of travel, a number of them didn't know what to do with themselves went back to work! Sad. In our case we had so many interests other than birding and hawk watching while both of us were practicing medicine that our retirement was seamless. I told them that they could see that I was a philosopher as well. The man's father was a birder, so I suggested guidance from him as well as joining a local bird club, as well as using the Merlin app, which they had, to figure out what they were hearing while hiking.

Weather:
Winds had blown in from the south last night so this morning the sky was completely overcast but there was no smoke haze over Denver, very clear air, clear visibility to 39 km to DIA, though there was virga between East and SE, winds from the WSW corresponding to the winds aloft at 700 hPa at the level hawks would migrate at, changing to ESE. By 10:00 a.m. DST there was some blue sky from the SW to the North, with very dark large clouds to the SW which bypassed us to the South. The sun came out intimately from 12:19 p.m. on.

Raptor Observations:
The first 0.5 hours we had 3 distant migrants, the first was a TV at 9:41 a.m. MST, after which the 10:00 hour had no migrants and not even local raptors, so it looked as if we would go home early with a low count, however at 11:28 a.m. a BW was seen with the naked eye slightly to the West/ overhead which was joined by 2 more, 2 more low BW easily seen with the naked eye which gradually rose in thermals to the point that we could barely see them with binoculars taking 6 minutes before migrating South, then a BW which took the same path followed by 3 BW which were merely dots in the sky requiring a scope to identify because of their compactness cf RT, flat wings in a soar or because of a 'twitchy' partial flap only. The next hour had 1 more and the next hour had 2 more for a total of 13 BW, uncommon as they are in the West as they are an Eastern breeder. The first local raptor were 2 TV at 12:32 p.m., oddly late. GE 2 adults. RT 1.

Non-raptor Observations:
RBNU 1, TOSO 1, WBNU 1 Eastern subspecies heard, WTSW 5, VGSW 18.PYNU 3, MOBL 1, WEBL 2, STJA1, MOCH 1, BBMA 1, SPTO 2. The Soaring Forecast of the NWS was for lift at 12 feet per second and height of thermals 9241 feet AGL, quite low, only 2,000 ft above the watch.

Predictions:
A chance of showers between noon and 3pm, then a chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 73. Light and variable wind becoming east 5 to 7 mph in the morning. Chance of precipitation is 30%.


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




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[cobirds] Late nesting barn swallows

Parking garage — Denver Botanic Gardens , 9/2/26 -- -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to cobirds@googlegroups.com For more options, visit this group at http://groups.google.com/group/cobirds * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate. * Join Colorado Field Ornithologists https://cobirds.org/membership/ --- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/cobirds/E626D755-461A-4A5A-B2E4-C8CE9956CBA4%40gmail.com.

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[cobirds] Chico Basin Ranch Banding Station Report-Bird Conservancy of the Rockies-September 14, 2026

Southwest winds are not the most favorable for birds migrating south. A couple Wilson's warblers banded a few days ago returned to get their energetic condition assessed again. Both Wilson's gained weight since they were last banded. Thirteen bird species were captured with two new species for the season including Ruby-crowned Kinglet and Plumbeous Vireo. It appears that there are quite a few Townsend's Warblers hangin around Colorado this fall season. A couple birders came by the banding station and showed us a Vermilion Flycatcher they saw at HQ pond. Always a pleasure to see what others are seeing on the ranch.
31 New Banded Birds
Wilson's Warbler- 17
Yellow Warbler- 1
MacGillivray's Warbler- 2
Ruby-crowned Kinglet- 1
Red-breasted Nuthatch- 1
Western Wood-Pewee- 1
Hammond's flycatcher- 1
Dusky Flycatcher-1
Cassin's Vireo- 2
Plumbeous Vireo- 1
Gambel's White-crowned Sparrow- 2
Yellow-breasted Chat- 1

3 Recaptures
Wilson's Warbler- 2
Brown Thrasher

The Banding station will be open tomorrow through Saturday at sunrise until @11:30 AM. If interested in visiting the Ranch, Please register online at www.aikenaudubon.com
Please stop by the banding station and share your sightings.

Have a good day,

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

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[cobirds] Migrating Birds Abound at Home Lake

Find the water and you'll find the birds. Pretty easy formula that seems to be working well in the otherwise DRY San Luis Valley. Yesterday at Home Lake, which has the water and the habitat, there was a bounty of interesting and unusual birds. Among the warblers, there were hundreds of Wilsons Warblers with a few MacGillivrays and others. At least two Townsend's Warblers were present. Other unusuals included Black Phoebe and Green Heron. Definitely a bird banquet and nourishment for the soul.

John Rawinski
Monte Vista, CO

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Sunday, 13 September 2026

[cobirds] Chatfield Banding Station: Week 3 Report

Last week started out very, very slow but our busy (for Chatfield) Saturday made up for those slow days. We ended the week with 72 new birds of 17 species banded, 10 same-season recaptures, and 3 returns from previous seasons.

New birds:

Black-capped Chickadee 2
Brewer's Sparrow (FOS) 2
Chipping Sparrow (FOS) 1
Common Yellowthroat (FOS) 1
Gray Catbird 3
Gambel's White-Crowned Sparrow (FOS) 1
House Finch 2
Lincoln's Sparrow 3
MaGillivray's Warbler 1
Northern House Wren 2
Orange-crowned Warbler 1
Song Sparrow 1
Spotted Towhee 3
White-breasted Nuthatch 1
Wilson's Warbler 44
Yellow-breasted Chat 3
Yellow Warbler 1

If you'd like to visit the station, you can register through Denver Audubon’s website.

Audrey Hicks
Bander, Denver Auduon + Bird Conservancy of the Rockies

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[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 9/13/26

Okay, here is the report for today, Sunday.

Forgot to mention yesterday how nice and cool it was.  We catch more birds on those days because the birds are more likely to be out and active then.  Plus, on the hottest days we are closing some/many/all nets early which also reduces the numbers caught.  So only 75 birds caught today (which in most seasons would seem like a big day!)  Wilson's Warblers still led the numbers but we have a good mix of species for our weekend visitors:

Western Flycatcher 1
Hammond's Flycatcher 1
Dusky Flycatcher 1
Warbling Vireo 1 (called it "unidentified", but it measured as a Western)
Hermit Thrush 1
Orange-crowned Warbler 1
Yellow Warbler 3
Yellow-rumped Warbler, Audubon's 2
Yellow-rumped Warbler, unidentified subspecies 1
Townsend's Warbler 4
Common Yellowthroat 3
Wilson's Warbler 43
Spotted Towhee 1
Green-tailed Towhee 2
Chipping Sparrow 1
Clay-colored Sparrow 1
Song Sparrow 2
Lincoln's Sparrow 3
White-crowned Sparrow, Gambel's 2
White-crowned Sparrow, Mountain 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] Bird Conservancy of the Rockies - Barr Lake Banding Report, 9/12/26

This is the Barr report for SATURDAY, 9/12/26.  (My apologies; my computer went crazy yesterday.)

We had another very busy day at Barr, banding a total of 128 birds.  As usual this year (and most years) driven by Wilson's Warblers.  We banded another 97 today, bringing our total to date to 679, which is more than any total season in at least the past 20 years.  They must have had a spectacular breeding season.  Here's the breakdown of the 128 banded Saturday:

Downy Woodpecker 1
Northern Flicker, Red-shafted 1 FOS
Willow Flycatcher 1
Hammond's Flycatcher 1
Dusky Flycatcher 1
Cassin's Vireo 1
Red-breasted Nuthatch 2
Northern House Wren 2
Golden-crowned Kinglet 1
Ruby-crowned Kinglet 1
Orange-crowned Warbler 1
Yellow Warbler 1
Yellow-rumped Warbler, Audubon's 4
Townsend's Warbler 1
Common Yellowthroat 1
Wilson's Warbler 97
Yellow-breasted Chat 1
Western Tanager 1 FOS
Spotted Towhee 2 FOS
Chipping Sparrow 1
Song Sparrow 1
Lincoln's Sparrow 1
Dark-eyed Junco, Oregon 3
Lazuli Bunting 1 FOS

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] Register now for BCAS bird walks and Teen Naturalists programs

Fall is around the corner, and birds are on the move! Join Boulder County Audubon Society for Saturday morning field trips with Carl Starace. These bird walks are free, but we do ask that you register. Details in the links below:

 

September 19 at Sandstone Ranch in Longmont: Possible species include Wild Turkey, Lesser Yellowlegs, Wilson’s Warbler, Marsh Wren. https://www.boulderaudubon.org/all-events/sandstone-ranch-carl-starace-sept19-2026

October 10 at White Rocks Trail: We’ll be looking for Wilson's Snipe, Gadwall, Northern Harrier, and the American Widgeon. https://www.boulderaudubon.org/all-events/white-rocks-trail-carl-starace-oct10-2026

October 31 at Rabbit Mountain Open Space: Possible species include Townsend's Solitaire, American Tree Sparrow, Ferruginous Hawk, Rock Wren. https://www.boulderaudubon.org/all-events/rabbit-mt-oct31-2026

 

Just For Teens

Be sure to get your favorite teenagers involved in birding and conservation with our upcoming Teen Naturalists programs!

 

Sunday, September 20, “How Weather Affects Bird Migration in the Front Range”

We will spend the morning at Lagerman reservoir looking for migrating birds. We’ll discuss where they may have come from, the weather that affects their passage and stopover, and the gap in our understanding of bird migration related to weather. Details and registration:

https://www.boulderaudubon.org/all-events/tn-sept2026-birds-weather

 

Sunday, October 11, “A Glimpse at a Unique Boulder Habitat - White Rocks Nature Preserve”

The area is host to a bald eagle nest, rare plants and a rare lizard that are found nowhere else in Boulder County. We’ll keep an eye out for fossils and view the creek scenery that will be at the height of fall color change in this unique sand prairie ecosystem. Details and registration: https://www.boulderaudubon.org/all-events/tn-oct2026-white-rocks

 

We’re continually updating the Field Trips page on our website, so check back often for new bird walks and outings: https://www.boulderaudubon.org/all-events?category=Field%20Trips

 

See you on the trail!

Kit


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Kit Seeborg
Board Member and Outreach Volunteer
Boulder County Audubon Society
Boulder, Colorado

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