Tuesday, 3 June 2025

[cobirds] Thrush flight intensifying

Hey, all.

I need to revisit my statement from earlier tonight that the Swainson thrush flight this Tues. evening, June 3, isn't East Coast–like in its intensity. Because right now (11:35pm MDT) it's like that. I'm hearing 5+ flight calls per minute. If you're an insomniac or for whatever other reason awake right now, go outside and listen. It's really something.

It's not lost on me that it's cool that the strongest spring night flight I've heard in quite some time here in Lafayette is happening well into the first week of June. Migration isn't over.

Ted Floyd
Lafayette, Boulder Co.

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[cobirds] Swainson's Thrush flight in progress right now, 9:50pm MDT, Tues., June 3, Lafayette, Boulder Co.

Hey, all.

Swainson thrushes are migrating over Lafayette, eastern Boulder Co., right now in the fine mist. Lovely to hear their little whistles in the darkness. Not a massive East Coast–style flight, but one or two per minute. Also a resident common nighthawk or two.

A few other odds and ends:

Yesterday, Mon., June 2, at Murphy's Pasture & environs, Pawnee National Grassland, Weld Co., Hannah Floyd and I found many grasshopper, Cassin, & Brewer sparrows. Great encounters, too, with a greater short-horned lizard and a prairie rattlesnake. We missed the funnel cloud directly over Briggsdale; we left too early.

And back on Sun., June 1, along the Fowler Trail & environs above Eldorado Springs, Boulder Co., Kieran Schnitzspahn, Hannah Floyd, Isabelle Busch, Owen Robertson, Archer Silverman, and I found at least six ovenbirds, along with the usual slug of Hammond flycatchers, plumbeous vireos, Virginia & MacGillivray warblers, and lazigo buntings. Also, a peregrine falcon, likely a resident.

Ted Floyd
Lafayette, Boulder Co.

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[cobirds] Bird Conservancy's annual Block Party, June 21


Hi all, 

Bird Conservancy's annual Block Party is a warm-weather celebration of birds, conservation, and community partners! Over 150 guests will soak up the sun at Maxline Brewing as they enjoy amazing beer, fun activities, and live music. This is an excellent opportunity to showcase your support of the natural world and the community of Fort Collins!

Bird lovers of all ages welcome! $30 per ticket.


Date and Time

Saturday, June 21, 2025
12:00 PM – 5:00 PM, (MDT)

Location

2724 McClelland Drive
Fort Collins, Colorado 80525
United States


Let me know if you have any questions about this event!

Nathan Pieplow
Board member, Bird Conservancy of the Rockies
Boulder, Colorado

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Re: [cobirds] Merlin and King Rail

Thank you Norm and Susan for your examples of Merlin being misused. For me, Merlin identified a coyote howl as a common loon, in the middle of a pinyon pine forest in Crestone, CO. 

I agree it is a great tool and also agree it should never replace actual sound and visual IDs by live humans.


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On Jun 2, 2025, at 7:18 PM, Norm Erthal <normanerthal@gmail.com> wrote:

If you are using Merlin to identify birds by sound only without significant experience with the songs and calls, you are likely making numerous mistakes. I know of experienced birders with some amazing birds it identifies that are simply not there. The other morning it identified Plumbeous Vireo, Veery, Scarlet Tanager, and Summer Tanager within a few minutes. For the latter two, it was using Robin calls. It would have been a staggering number of new yard birds. In an Arvada park, I "tallied" Common Loon (a cow}, Pygmy Nuthatch {no trees within 200 feet} and Red Crossbill. Merlin is a great tool, but the frequency of misidentifications occurs very often. It has identified Prairie Dogs as Savannah Sparrow and squirrels as several things. A friend of mine had three first state records in his yard, none of which existed. The phrase "identified by Merlin" are the three scariest words my friends and I see on reports. If it "identifies" a rare bird, you need to see it.

The King Rail at Chico Basin needs good recordings for me to believe it was there. Nathan Pieplow made recordings of what others were calling the King Rail and after analyzing them as a female Virginia Rail. Nathan is excellent at doing this. There was a King Rail that was reported at John Martin several years ago. He again made recordings and again it was a Virginia Rail. I am very skeptical of King Rail id's without recordings that he has reviewed.


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Re: [cobirds] Anhinga, Boulder County

The Anhinga is still present.

Ken Wat
Aurora

On Mon, Jun 2, 2025, 12:43 PM Nathan Pieplow <npieplow@gmail.com> wrote:
An Anhinga found by Greg Levandowski is currently being seen by multiple birders at 95th and Boulder Creek in eastern Boulder County. 

https://goo.gl/maps/jinaS5D6pHBMMA5m9

Christian Nunes forwards the following request from Open Space: "Please don't park on the newly planted restoration area. Also please don't block any ranch gates. Parking closer to boulder creek is allowable, but please don't disturb the Osprey at their nest."

I will add that a cyclist was killed by a car very near here a few days ago. Be very careful if birding along this busy stretch of road.

Nathan Pieplow 
Boulder 


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Monday, 2 June 2025

[cobirds] Nighthawks & Nighthawks & Nighthawks - Arapahoe

With nightjars, there's a thin line between faith and stubbornness.

Tonight, I was rewarded by whatever we want to call my ritual of looking at the darkening and too often empty sky during the last week of May and the first of June. Eight Common Nighthawks flew over, a good number for spring migration. 

The first seven were in three groups (3 - 2 - 2) and flew moderately low and moderately directly northwest.

The eighth hung around over my west Centennial house, flying low loops, roughly at the level of the bats (Big Brown Bats, presumably?). 

- Jared Del Rosso
Centennial, CO

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Re: [cobirds] Merlin and King Rail

If I believed everything Merlin ID'd, I'd have Cardinals all over the place! 

Apparently, Starlings and Mockingbirds can easily fool Merlin. 

That said, it's a really useful additional tool to use. I'm sure it will improve over time.

Susan Rosine 
Brighton

On Mon, Jun 2, 2025, 7:18 PM Norm Erthal <normanerthal@gmail.com> wrote:

If you are using Merlin to identify birds by sound only without significant experience with the songs and calls, you are likely making numerous mistakes. I know of experienced birders with some amazing birds it identifies that are simply not there. The other morning it identified Plumbeous Vireo, Veery, Scarlet Tanager, and Summer Tanager within a few minutes. For the latter two, it was using Robin calls. It would have been a staggering number of new yard birds. In an Arvada park, I "tallied" Common Loon (a cow}, Pygmy Nuthatch {no trees within 200 feet} and Red Crossbill. Merlin is a great tool, but the frequency of misidentifications occurs very often. It has identified Prairie Dogs as Savannah Sparrow and squirrels as several things. A friend of mine had three first state records in his yard, none of which existed. The phrase "identified by Merlin" are the three scariest words my friends and I see on reports. If it "identifies" a rare bird, you need to see it.

The King Rail at Chico Basin needs good recordings for me to believe it was there. Nathan Pieplow made recordings of what others were calling the King Rail and after analyzing them as a female Virginia Rail. Nathan is excellent at doing this. There was a King Rail that was reported at John Martin several years ago. He again made recordings and again it was a Virginia Rail. I am very skeptical of King Rail id's without recordings that he has reviewed.

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[cobirds] Merlin and King Rail

If you are using Merlin to identify birds by sound only without significant experience with the songs and calls, you are likely making numerous mistakes. I know of experienced birders with some amazing birds it identifies that are simply not there. The other morning it identified Plumbeous Vireo, Veery, Scarlet Tanager, and Summer Tanager within a few minutes. For the latter two, it was using Robin calls. It would have been a staggering number of new yard birds. In an Arvada park, I "tallied" Common Loon (a cow}, Pygmy Nuthatch {no trees within 200 feet} and Red Crossbill. Merlin is a great tool, but the frequency of misidentifications occurs very often. It has identified Prairie Dogs as Savannah Sparrow and squirrels as several things. A friend of mine had three first state records in his yard, none of which existed. The phrase "identified by Merlin" are the three scariest words my friends and I see on reports. If it "identifies" a rare bird, you need to see it.

The King Rail at Chico Basin needs good recordings for me to believe it was there. Nathan Pieplow made recordings of what others were calling the King Rail and after analyzing them as a female Virginia Rail. Nathan is excellent at doing this. There was a King Rail that was reported at John Martin several years ago. He again made recordings and again it was a Virginia Rail. I am very skeptical of King Rail id's without recordings that he has reviewed.

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[cobirds] Viewing the Anhinga

Birders,

First, there is a female ANHINGA at the second pond north of Boulder Creek along the east side of 95th St. in Boulder County. Found by Greg Levandoski earlier today. https://maps.app.goo.gl/J37AGTo3KowDoSaz7?g_st=com.google.maps.preview.copy

A few things to please be aware of while viewing the bird on Boulder Valley Farm: 

-the ponds and surrounding farmland are closed to the public. The bird is perfectly visible from the road.
-the sides of the road were recently seeded and are actively being restored after a large construction project. Please, please do not park on or trample this restoration site.
-do not block ranch gates and be courteous to the ranch manager, John, if you see him. 
-there is an active Osprey nest a few hundred yards south of the Anhinga pond, close to the Boulder Creek bridge. Please give them space. 

Happy chasing,
 
Christian Nunes
City of Boulder OSMP

[cobirds] Anhinga, Boulder County

An Anhinga found by Greg Levandowski is currently being seen by multiple birders at 95th and Boulder Creek in eastern Boulder County. 

https://goo.gl/maps/jinaS5D6pHBMMA5m9

Christian Nunes forwards the following request from Open Space: "Please don't park on the newly planted restoration area. Also please don't block any ranch gates. Parking closer to boulder creek is allowable, but please don't disturb the Osprey at their nest."

I will add that a cyclist was killed by a car very near here a few days ago. Be very careful if birding along this busy stretch of road.

Nathan Pieplow 
Boulder 


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[cobirds] Devil's Backbone - nice spot right now to view Lazuli Buntings, Blue Grosbeaks, Rock Wrens, etc. breeding

There are never a ton of species here, but because of the side slope and scrub oak you are quite near the breeding birds ... plus it's a beautiful spot. Good chance to spend some time looking at markings and behavior (like Rock Wrens doing deep knee bends).

Every year the buntings, grosbeaks, wrens join a Yellow-Breasted Chat, Swifts, and Lark Sparrows in the oak and the cliffs. Wildflowers aren't spectacular this year but they are in full bloom now. 

Free if you have a Larimer parks pass.

List from this morning - https://ebird.org/checklist/S245944354

Brad Dobson
Loveland, CO

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Sunday, 1 June 2025

[cobirds] Migration at Chico Basin Ranch, Pueblo and El Paso Counties June 1st

Chico Basin Ranch closes for spring after the last open session 7am-1pm tomorrow.

Kara, Sam, I birded there today.  A few warblers were about today:
A male Blackpoll Warbler (which I had missed everywhere this spring), singing Northern Parula, singing American Redstart at Headquarters Willows -- Pueblo County, (plus a rattlesnake in the grass) and a another Northern Parula in the banding station Woods (El Paso County).  

Other late migrants that should be on their breeding grounds elsewhere, that we saw today: Wilson's Warbler, Audubon's Yellow-rumped Warbler, Olive-sided, Willow, and Western Flycatchers, Western Tanager, Lincoln's Sparrow, Swainson's Thrush, Plumbeous Vireo, Yellow-billed Cuckoo, 

Some late waterfowl continue as well: female Common Goldeneye and male Lesser Scaup.

Brandon Percival
Pueblo West, CO

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[cobirds] Swallows, flycatchers, a nighthawk - Arapahoe

All the best birds are insectivores. 

Weekly, I visit Eastern Phoebes along the High Line Canal Trail in Centennial / Greenwood Village. During my visit on 5/28, I also heard Western Flycatchers, my first of the year there. They've been nesting along the Canal and nearby Little Dry Creek since at least 2018. (The phoebes began nesting there last year, as far as I know.)

On May 30, nest-building Cliff Swallows were numerous at the Streets of Southglenn shopping center in Centennial. I've not previously seen them in high numbers at this outdoor mall. (Barn and Violet-green Swallows also nest there.)

On May 31, I had my first nighthawk sighting of the year. The bird flew directly north, with just a few flutters off its path to flycatch. 

- Jared Del Rosso
Centennial, CO

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[cobirds] Chatfield Banding Station - Bird Conservancy of the Rockies 5/31/25

Our last day seemed like it should be the last day of monitoring spring migration.  We banded only 8 birds plus caught 8 that had been previously caught this season.  Only 2 of the 8 new birds and none of the recaps were for sure migrating through - a Swainson's Thrush and a MacGillivray's Warbler.  A majority of the summer and year-round resident birds showed signs of breeding. 

A few unofficial observations about the season (subject to change once data is finalized):

The first couple of weeks were dismal, well below normal, followed by a couple of fairly robust weeks.  In the end, preliminary results show we are in the normal range for total birds caught.  This was made possible, at least in part, by a banner year for Gray Catbirds, which this year are challenging Yellow Warblers for the most caught species title.

Flycatchers continue to be in short supply.  Swainson's Thrush numbers are up, but there were very few Hermit Thrushes.

Here are the 8 new birds banded on our final day of the season:

Swainson's Thrush 1
Gray Catbird 1
Yellow Warbler 2
MacGillivray's Warbler 1
Yellow-breasted Chat 1
Song Sparrow 2

Thanks as always to the loyal crew of volunteers who make it possible to efficiently run a banding station that monitors birds while sharing information with school groups and/or the general public every day of the season.  You tolerate the slow days and step up when it gets busy.  This season you also got to protect the birds from a persistent bobcat (who had to be chased off almost every day), a snapping turtle (who chose to lay her eggs directly under net 26), numerous deer (who are not interested in the birds but seem to enjoy destroying nets), and rumors of a fox prowling around net 22.

Thanks also to all you who care deeply about birds.  I have e-mails from several of you to which I have not yet responded; I will do so before heading off to the CFO conference at the end of this coming week!

Until next season,

Meredith McBurney
Chatfield Bander
Bird Conservancy of the Rockies


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