[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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[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (13 Sep 2026) 23 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 13, 2026
Species	Day's Count	Month Total	Season Total
Black Vulture	0	0	0
Turkey Vulture	6	56	161
Osprey	0	16	18
Bald Eagle	0	1	2
Northern Harrier	0	1	2
Sharp-shinned Hawk	1	3	6
Cooper's Hawk	1	38	52
American Goshawk	0	0	0
Broad-winged Hawk	0	0	0
Red-tailed Hawk	9	151	308
Rough-legged Hawk	0	0	0
Swainson's Hawk	1	70	85
Ferruginous Hawk	0	1	1
Golden Eagle	0	1	2
American Kestrel	4	43	63
Merlin	0	0	0
Peregrine Falcon	0	0	1
Prairie Falcon	0	0	1
Mississippi Kite	0	0	0
Unknown Accipitrine	1	2	2
Unknown Buteo	0	0	1
Unknown Falcon	0	0	0
Unknown Eagle	0	0	0
Unknown Raptor	0	1	2
Total:	23	384	707

Observation start time:	08:30:00
Observation end time:	13:00:00
Total observation time:	4.5 hours
Official Counter	Zak Hepler
Observers:

Visitors:
First visitors of the day were Frank and Judy from Ohio. They have a daughter who likes eagles and she is a naturalist. A few different people liked taking phone calls at the Watch. They must have better reception than I do. The heat kept most people from lingering too long. I took requested photos of three different groups of people throughout the day. One couple brought their own stand for their camera like a photoshoot.

Weather:
Beautiful blue sky. No clouds covered the hawk watch during the entirety of the shift. Reaching high 80s with strong SE gusts. Not stormy whatsover and visibility reached 39 km throughout the entire watch.

Raptor Observations:
First migrant was an AK at 9:18 AM. Only one SW was reported at 11:00 AM. Most raptors leveraged the lift from Kestrel Channel and North Channel. These gullies allowed the birds to get lift without being blown around as much as they would have being exposed on the outside of the range. The highest count at the watch today happened between 11AM-12PM. Overall, it was not very migrant-heavy, but fairly steady. I had considered that the birds were too high in the air to be visible, but when scanning, I did not get any new birds. Non migrant raptors: 6 TUVU, 2 COHA, 9 RTHA

Non-raptor Observations:
I noticed that the WTSW became active at 9:06 AM and the fireants became active around 9:45 AM. The prairie fence lizard sighting was at 10:06 AM and it hung around for quite awhile. Only two paragliders were seen today. The first took off at 10:52 AM and the second was at 12:28 PM. 2 ROPI, 6 WTSW, 5 NOFL, 5 BBMA, 2 AMCO, 6 CORA, 7 MOCH, 18 VGSW, 2 BARS, 4 PYNU, 2 RBNU, 7 BGGN, 1 ROWR, 1 AMRO, 3 PISI, 1 AMGO, 2 GTTO, 3 SPTO, 1 WIWA

Predictions:
Another warm day with a chance of afternoon thunderstorms (20%). This is typical of the front range at this time of year. We can also expect the western wind in the morning until the air over Denver warms up to create the eastern breeze that we experience.

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Report submitted by Zak Hepler (zakhepler@gmail.com)
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]

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Re: [cobirds] Re: Late nesting barn swallows

And now that I have spent a weekend day at home with these birds, I can report that the juvenile Barn Swallows on the nest outside my door are receiving regular feeding visits from an adult as of a few minutes ago. Sometimes they are getting fed outside the nest, sometimes inside. When they're outside the nest, I suppose the appropriate breeding code is DY (dependent young). When they're in the nest, I suppose it's FY (feeding young, i.e., nestlings). I don't know how common this situation is in this or other species, or how well documented.

Nathan Pieplow

Boulder

On Sat, Sep 12, 2026 at 2:32 PM Jared Del Rosso <jared.delrosso@gmail.com> wrote:

Inspired by Nathan's post and wondering whether the young Barn Swallows were still in the nest, I took a short walk at the same shopping center in Arapahoe County around 2:10 PM this afternoon. The two Barn Swallows were still in the nest, looking chubby and very soon able to leave the nest. In the very short time I visited them (approx. 5 seconds), an adult came in and fed them at the nest. On my walk to the nest, it looked like other feeding flights were made into the nest area.  

- Jared Del Rosso

Centennial, CO

On Saturday, September 12, 2026 at 11:38:26 AM UTC-6 Nathan Pieplow wrote:

Scott, Jared, et al.:

I have a Barn Swallow nest right outside my front door, and in most years it fledges two broods. As of last night, the three juveniles from the second brood were still returning to the nest regularly during the day and roosting in it every night, even though their first flights took place probably ten days ago. The nest is frequently empty when I leave for work in the morning, and I often come home from work in the afternoon to find all three juveniles huddled inside it. 

This raises a question of what counts as "fledging" in this species, and how one can tell. The nest that Scott observed was definitely on a later schedule than the one at my house, since the parents haven't been regularly feeding at my house for over a week, but as late as yesterday the nest would probably have earned a legitimate "NY" breeding code if someone happened upon it at the right time of day. 

Nathan Pieplow

Boulder

On Sat, Sep 12, 2026 at 10:00 AM Jared Del Rosso <jared.d...@gmail.com> wrote:

Inspired by Scott's posts about these swallows, I went for a short "walk" at a local shopping center in Greenwood Village-ish (closer to Littleton & west Centennial than DTC) in Arapahoe County where Barn Swallows typically nest. The first three or so nests were empty, but the fourth had young in it. Two, I think? 

- Jared Del Rosso

Centennial, CO

On Friday, September 11, 2026 at 8:50:24 AM UTC-6 Scott Somershoe wrote:

I’ve been checking a Barn Swallow nest near my house in Littleton for the last week. I was sure they would have fledged by today, but there are still four young being fed by parents about every 30 seconds! Yes, today, Sept 11. 

The latest nest with young in the 2nd Colorado Breeding Bird Atlas was 9 Sept. This nesting attempt is definitely at the very tail end of nesting and maybe the latest recorded nest with young in the state. Either way, these youngins need to get a move on! 

Cheers,

Scott Somershoe 

Littleton, JeffCo. 

eBird Checklist - 11 Sep 2026 - Lilly Gulch Regional Trail--S Kipling Pkwy to S Pierce St. - 20 species ebird.org

Sent from my iPhone

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Re: [cobirds] Re: Late nesting barn swallows

Inspired by Nathan's post and wondering whether the young Barn Swallows were still in the nest, I took a short walk at the same shopping center in Arapahoe County around 2:10 PM this afternoon. The two Barn Swallows were still in the nest, looking chubby and very soon able to leave the nest. In the very short time I visited them (approx. 5 seconds), an adult came in and fed them at the nest. On my walk to the nest, it looked like other feeding flights were made into the nest area.  

- Jared Del Rosso

Centennial, CO

On Saturday, September 12, 2026 at 11:38:26 AM UTC-6 Nathan Pieplow wrote:

Scott, Jared, et al.:

I have a Barn Swallow nest right outside my front door, and in most years it fledges two broods. As of last night, the three juveniles from the second brood were still returning to the nest regularly during the day and roosting in it every night, even though their first flights took place probably ten days ago. The nest is frequently empty when I leave for work in the morning, and I often come home from work in the afternoon to find all three juveniles huddled inside it. 

This raises a question of what counts as "fledging" in this species, and how one can tell. The nest that Scott observed was definitely on a later schedule than the one at my house, since the parents haven't been regularly feeding at my house for over a week, but as late as yesterday the nest would probably have earned a legitimate "NY" breeding code if someone happened upon it at the right time of day. 

Nathan Pieplow

Boulder

On Sat, Sep 12, 2026 at 10:00 AM Jared Del Rosso <jared.d...@gmail.com> wrote:

Inspired by Scott's posts about these swallows, I went for a short "walk" at a local shopping center in Greenwood Village-ish (closer to Littleton & west Centennial than DTC) in Arapahoe County where Barn Swallows typically nest. The first three or so nests were empty, but the fourth had young in it. Two, I think? 

- Jared Del Rosso

Centennial, CO

On Friday, September 11, 2026 at 8:50:24 AM UTC-6 Scott Somershoe wrote:

I’ve been checking a Barn Swallow nest near my house in Littleton for the last week. I was sure they would have fledged by today, but there are still four young being fed by parents about every 30 seconds! Yes, today, Sept 11. 

The latest nest with young in the 2nd Colorado Breeding Bird Atlas was 9 Sept. This nesting attempt is definitely at the very tail end of nesting and maybe the latest recorded nest with young in the state. Either way, these youngins need to get a move on! 

Cheers,

Scott Somershoe 

Littleton, JeffCo. 

eBird Checklist - 11 Sep 2026 - Lilly Gulch Regional Trail--S Kipling Pkwy to S Pierce St. - 20 species ebird.org

Sent from my iPhone

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[cobirds] Chico Basin Ranch Banding Station Report-Bird Conservancy of the Rockies-September 12, 2026

A breezy start to the morning caused us to not set all the nets until it calmed down mid-morning. Fifteen bird species were banded with a Gambel's White-crowned Sparrow being the first of the season.

39 New Birds Banded

Wilson's Warbler- 17

MacGillivray's Warbler- 2

N. House Wren- 2

Western Flycatcher- 1

Hammond's Flycatcher- 2

Western Wood-Pewee- 1

Red-breasted Nuthatch- 2

Lincoln's Sparrow- 3

Green-tailed Towhee- 2

Spotted Towhee- 1

Gambel's White-crowned Sparrow- 1

Western Tanager- 1

Swainson's Thrush- 1

Gray Catbird- 1

Brown Thrasher- 2

Recapture

Gray Catbird- gained almost 2 grams since it was banded.

The banding station will be closed tomorrow and open back up on Monday at Sunrise. If interested in visiting the ranch tomorrow or this coming week, please register online at www.hotmail.com

Have a good Sunday!

Julie Shieldcastle, Bander

Chico Basin Ranch

Bird Conservancy of the Rockies

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[cobirds] Neenoshe flycatchers IDs and some eBird rambling

Hi folks, The overwhelming ID suggested by COBirders for the three flycatchers I saw this week at Neenoshe Reservoir is Olive-sided Flycatcher. The yellow cast to their bellies suggests that they are first-year birds. Also, the lack of wing bars points away from Ash-throated. I checked Sibley’s illustrations and noted too that Olive-sideds have white edges to their tertials, which is seen in one of my photos. When I saw the birds in the field, my first ID was Olive-sided Flycatcher. But when I was entering the sighting into the eBird app, and I entered “3” for the tally, the app required a comment due to the “high” number. I second-guessed myself, because the shape of the birds as they clung to the tree in the strong wind was different from that I expect of a less stressed Olive-sided. I realize that eBird's comment requirement is intended to safeguard against incorrect tally entries, but it can also prevent a birder from entering correct data if the birder interprets the requirement as a you-can’t-possibly-be-correct-and-must-be-a-moron nudge. Back here in Boulder, I daily see a zillion American Goldfinch at the Boulder Community Gardens, and the eBird app requires a comment when I report more than around 50. I can imagine a birder who tallies over 200 American Goldfinches at the Gardens deciding not to enter them into eBird at all, for fear that they’re making a mistake, which would be a shame as we need all the data about our dwindling bird populations that we can get. I’ve been doing some math to estimate the number of goldfinches at the Gardens, and am realizing that my tallies of 100 or 200 are likely a dramatic underestimate. (There are around 100 individual plots in the Gardens, and during sunflower season most plots have at least 1 goldfinch, and many have 5+…) I met an experienced birder from Florida the other day at Lagerman Res. She explained that she never entered a sighting into eBird unless she had taken a photo of the bird and run it through Merlin for a confirmation. I appreciate the caution, but I would think that the overall eBird data set would be richer if the birder trusted themselves a bit more. I guess at Neenoshe I should have trusted myself more, too. Thanks very much to those who responded! Richard Trinkner Boulder -- -- 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/506E74D7-79A2-423A-8815-6D2B716FD607%40icloud.com.

Re: [cobirds] Re: Late nesting barn swallows

Scott, Jared, et al.:

I have a Barn Swallow nest right outside my front door, and in most years it fledges two broods. As of last night, the three juveniles from the second brood were still returning to the nest regularly during the day and roosting in it every night, even though their first flights took place probably ten days ago. The nest is frequently empty when I leave for work in the morning, and I often come home from work in the afternoon to find all three juveniles huddled inside it. 

This raises a question of what counts as "fledging" in this species, and how one can tell. The nest that Scott observed was definitely on a later schedule than the one at my house, since the parents haven't been regularly feeding at my house for over a week, but as late as yesterday the nest would probably have earned a legitimate "NY" breeding code if someone happened upon it at the right time of day. 

Nathan Pieplow

Boulder

On Sat, Sep 12, 2026 at 10:00 AM Jared Del Rosso <jared.delrosso@gmail.com> wrote:

Inspired by Scott's posts about these swallows, I went for a short "walk" at a local shopping center in Greenwood Village-ish (closer to Littleton & west Centennial than DTC) in Arapahoe County where Barn Swallows typically nest. The first three or so nests were empty, but the fourth had young in it. Two, I think? 

- Jared Del Rosso

Centennial, CO

On Friday, September 11, 2026 at 8:50:24 AM UTC-6 Scott Somershoe wrote:

I’ve been checking a Barn Swallow nest near my house in Littleton for the last week. I was sure they would have fledged by today, but there are still four young being fed by parents about every 30 seconds! Yes, today, Sept 11. 

The latest nest with young in the 2nd Colorado Breeding Bird Atlas was 9 Sept. This nesting attempt is definitely at the very tail end of nesting and maybe the latest recorded nest with young in the state. Either way, these youngins need to get a move on! 

Cheers,

Scott Somershoe 

Littleton, JeffCo. 

eBird Checklist - 11 Sep 2026 - Lilly Gulch Regional Trail--S Kipling Pkwy to S Pierce St. - 20 species ebird.org

Sent from my iPhone

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