Re: [cobirds] Chestnut Sided Warbler Costilla

Female, I presume? 

Chris Hobbs

Lenexa KS

chobbs.f1@gmail.com 

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From: cobirds@googlegroups.com <cobirds@googlegroups.com> on behalf of Luke Pheneger <phenegerluke@gmail.com>
Sent: Thursday, June 4, 2026 5:42:46 PM
To: Colorado Birds <Cobirds@googlegroups.com>
Subject: [cobirds] Chestnut Sided Warbler Costilla

 

Hi all,

Yesterday, Jeff, Jeina Livingston, and I had a Chestnut-sided Warbler at Rito Seco Park in Costilla County. The exact pin was here (37.2533571, -105.3312214). This is a first eBird record for the county. I looked for the bird a bit this morning but could not refind it. That said, I think the area is well worth additional coverage, both for the Chestnut-sided Warbler and other late migrants. The site could be somewhat of a “breeder trap”, with a dense willowy oasis bordering a diverse conifer forest. 

Also present at the park was a calling Swainson’s Thrush, which represented just the fourth eBird record for the county. Costilla gets very little eBird coverage away from Smith Reservoir, so species that breed locally but aren’t common in the valley are often underrepresented there. For example, last year Sean Huntley, Archer Silverman, and I had Flammulated Owl, Northern Saw-whet Owl, Long Eared Owl, and Northern Pygmy-Owl along a single road, all of which had less than 3 eBird records at the time. I bring this up not to brag, but to illustrate just how much of the county remains underbirded. If you’re looking to contribute eBird data to a region of the state that truly lacks coverage, consider exploring Costilla.

Luke Pheneger

Longmont

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[cobirds] Chestnut Sided Warbler Costilla

Hi all,

Yesterday, Jeff, Jeina Livingston, and I had a Chestnut-sided Warbler at Rito Seco Park in Costilla County. The exact pin was here (37.2533571, -105.3312214). This is a first eBird record for the county. I looked for the bird a bit this morning but could not refind it. That said, I think the area is well worth additional coverage, both for the Chestnut-sided Warbler and other late migrants. The site could be somewhat of a “breeder trap”, with a dense willowy oasis bordering a diverse conifer forest. 

Also present at the park was a calling Swainson’s Thrush, which represented just the fourth eBird record for the county. Costilla gets very little eBird coverage away from Smith Reservoir, so species that breed locally but aren’t common in the valley are often underrepresented there. For example, last year Sean Huntley, Archer Silverman, and I had Flammulated Owl, Northern Saw-whet Owl, Long Eared Owl, and Northern Pygmy-Owl along a single road, all of which had less than 3 eBird records at the time. I bring this up not to brag, but to illustrate just how much of the county remains underbirded. If you’re looking to contribute eBird data to a region of the state that truly lacks coverage, consider exploring Costilla.

Luke Pheneger

Longmont

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[cobirds] Chico Basin Ranch Banding Report, June 4, 2026-Bird Conservancy of the Rockies

It appears that spring migration is pretty much over. There is a few stragglers still around. The Prothonotary Warbler was viewed at Headquarters Willows this morning but was observed flying north around 11 AM. So maybe it will hang out on the ranch or it has better things to do? It was a beautiful morning at the banding station even if there was few birds around. Not even a lot of breeding bird singing happening today. The female Common Yellowthroat was not hanging around. She was a fat bird. She was still in migration mode.

4 New Banded Birds 

Common Yellowthroat- 1

American Goldfinch- 1

House Finch- 2 Hatching year birds

No Recaptures

The banding station will be open tomorrow and Saturday from sunrise until @ 11AM. Saturday is the last day for the season. MANY THANKS to the volunteers putting in time to assist with the spring season. Thank you very much!

If interested in visiting the ranch these next couple days, Please register on the Aiken Audubon Website www.aikenaudubon.com

Have a good day!

Julie Shieldcastle

Bander, Chico Basin Ranch

Bird Conservancy of the Rockies

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[cobirds] Contact Info for Mike Carter, CBO founder & early director

Hi. I'm trying to get in contact with Mike Carter, the founder of Colorado Bird Observatory (now Bird Conservancy of the Rockies) regarding collaboration between CBO and banders at the Lykins Gulch/Allegra Collister Nature Preserve banding station in the early 1990s.  

If anyone has current contact information for Mike, I would appreciate it if you could pass my message along or let me know how to contact Mike.  I was given an @pljv.org email but a message to that email bounced. 

If you write me back, please don't reply all to the whole group. I wouldn't want Mike's information shared with everybody on this list. 

Thank you,
Megan 

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Megan Jones Patterson

Boulder County, CO

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[cobirds] Chico Basin Ranch Banding Report, June 3, 2026-Bird Conservancy of the Rockies

Since it is the tail end of bird migration, I am not expecting any numbers. There has been some migrants still coming through. Northern Parula was singing when putting the nets up today. A Magnolia and Prothonotary Warbler were observed and photographed by birders at Headquarters little pond this morning. The nets are still catching Swainson's Thrushes. What will tomorrow look like? Hopefully, we can reach double digits.

7 New Banded Birds

Western Kingbird- 1

Swainson's Thrush- 2

Orchard Oriole- 1

Bullock's Oriole- 1

Blue Grosbeak- 1

American Robin- 1

4 Breeding Bird Recaptures

Bullock's Oriole- 3

Blue Grosbeak- 1

The banding station will be open tomorrow through Saturday from sunrise until @ 11AM.

Remember if wanting to visit the ranch, please register on the Aiken Audubon website. www.aikenaudubon.com

Have a good day,

Julie Shieldcastle

Bander, Chico Basin Ranch

Bird Conservancy of the Rockies

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[cobirds] Chico Basin Ranch Banding Report, June 2, 2026-Bird Conservancy of the Rockies

Well, you sure cannot depend on the weather forecast here. This morning was a bit cooler than predicted but we caught more birds than yesterday. A couple new species for the season include: White-eyed Vireo and Curve-billed Thrasher. Not sure what the thrasher was doing near the nets; however, a nice bird to see.

15 New Banded Birds

White-eyed Vireo- 1

Willow Flycatcher- 1

Swainson's Thrush- 9

Bullock's Oriole- 2

Brown Thrasher- 1

Curve-billed Thrasher- 1

3 Recaptures-breeding species

American Robin

Yellow Warbler

Bullock's Oriole

Birds are in full breeding and still a few migrants trickling through. Birder's have observed Ladder-backed Woodpecker, American Robin, House Finch families on the ranch.

If wanting to visit the ranch this week, please register online at the Aiken Audubon website www.aikenaudubon.com

The banding station will be open tomorrow through Saturday from sunrise until @ 11AM.

Please stop by to share our sightings.

Have a good day,

Julie Shieldcastle

Bander, Chico Basin Ranch

Bird Conservancy of the Rockies

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Re: [cobirds] Need identification help - from RMNP

Hi Evon,

That is a Horned Lark.

David

On Tue, Jun 2, 2026 at 9:10 AM Evon Holladay <eholladay303@gmail.com> wrote:

We were in Estes Park/RMNP for the big snow storm the week of May 4. We spotted this little one foraging along the road.

Any ideas? It clearly has a black stripe around the neck.

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EH

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