[cobirds] FOS hummingbird, Douglas Couny

[John Ealy]

We had a hen wild turkey scratching around our patch for about a half-hour 
this morning,  three turkey vultures soaring over the neighborhood and, at 
5:40 p.m., a male broadtail hummingbird at one of our feeders.
John Ealy
Roxborough Park, Douglas County, CO

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[cobirds] Dinosaur Ridge - Denver Field Ornithologists (11 Apr 2021) 37 Raptors

[reports]

Dinosaur Ridge - Denver Field Ornithologists
Colorado, USA
Daily Raptor Counts: Apr 11, 2021
---

SpeciesDay's CountMonth Total   Season Total
-- --- -- --
Black Vulture0  0  0
Turkey Vulture   9 38 41
Osprey   1  1  1
Bald Eagle   2  5 18
Northern Harrier 0  2  2
Sharp-shinned Hawk   2 11 25
Cooper's Hawk3 25 36
Northern Goshawk 0  3  7
Red-shouldered Hawk  0  0  0
Broad-winged Hawk0  1  1
Red-tailed Hawk  7 68261
Rough-legged Hawk0  0  1
Swainson's Hawk  0  3  3
Ferruginous Hawk 0  1  7
Golden Eagle 0  0  6
American Kestrel10 26 28
Merlin   1  4  8
Peregrine Falcon 1  2  6
Prairie Falcon   0  2  3
Mississippi Kite 0  0  0
Unknown Accipiter1  2  3
Unknown Buteo0  6 15
Unknown Falcon   0  1  3
Unknown Eagle0  0  0
Unknown Raptor   0  0  3

Total:  37201478
--

Observation start time: 09:00:00 
Observation end   time: 15:00:00 
Total observation time: 6 hours

Official Counter:Santi Tabares

Observers:Carol Cwiklinski, Reed Gorner

Visitors:
Several people asked about what we were doing, 4 people hung around and
helped spot hawks. 


Weather:
Consistent winds from the east, partly cloudy. 

Raptor Observations:
On and off migration, raptors moving mostly along Dinosaur Ridge and over
Mt. Morrison. 

Non-raptor Observations:
Usual swifts, scrub-jays, solitaires, bushtits and more. Saw elk north of
I-70 and deer on Dino Ridge. 4 runaway balloons as well. 

Predictions:
Hopefully more migration? 

Report submitted by DAVID HILL ()
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
http://www.dfobirds.org


More site information at hawkcount.org:  
https://hawkcount.org/siteinfo.php?rsite=123

Site Description:
Dinosaur Ridge is the only regularly staffed hawkwatch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Dinosaur
Ridge may be the best place in the country to see the rare dark morph of
the Broad-winged Hawk (a few are seen each spring). Hawkwatchers who linger
long enough may see resident Golden Eagles, Red-tailed Hawks and Prairie
Falcons, in addition to migrating Swainson's, Cooper's and Sharp-shinned
Hawks, American Kestrels and Turkey Vultures. Peregrine Falcons and
Ferruginous Hawks are uncommon; Northern Goshawk is rare but regular.
Non-raptor species include Rock Wren, and sometimes Bushtit, Western
Bluebird, Sandhill Crane, White-throated Swift, American White Pelican or
Dusky Grouse. Birders of any skill level are always welcome.  HawkWatch at
Dinosaur Ridge is generally staffed by volunteers from about 9 AM to around
3 PM from March 1st to May 7th.

Directions to site:
>From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow small signs from
the southwest end of lot to the hawkwatch site. The hike starts heading
east on an old two-track and quickly turns south onto a trail on the west
side of the ridge. When the trail nears the top of the ridge, turn left,
head through the gate, and walk to the clearly-visible, flat area at the
crest of the ridge.  (Distance: 0.56 miles, Elevation gain: 259 feet)


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Re: [cobirds] Re: ID of Clark’s vs Western at Sterns Lake (Boulder County)

[Mark Minner-lee]

Thanks to all for the helpful descriptions and information.

Regards,

Mark Minner-Lee
Erie, CO

Sent from my iPhone

> On Apr 11, 2021, at 3:14 PM, Adam Vesely  wrote:
> 
> Mlodinow and Leukering (2018) wrote a fantastic and informative piece in 
> Colorado Birds about identification of Western and Clark's Grebes along with 
> thorough discussion of hybrids. Not sure if this link will work, but try this:
> 
> https://cobirds.org/Publications/ColoradoBirds/InTheScope/84.pdf
> 
> Adam Vesely
> Thornton, CO 
> 
>> On Sunday, April 11, 2021 at 11:20:26 AM UTC-6 Mark Minner-lee wrote:
>> If anyone has been out to see the Western and possible Clark’s Grebes at 
>> Stern’s Lake (Boulder County) I’d love some thoughts on how you determined a 
>> Clark’s ID. Additional commentary also welcome from others who would like to 
>> lend their expertise. 
>> 
>> The two grebes I saw both fit Western or Intermediate but not Clark’s. 
>> Flanks on both birds were dark (suggesting Western). Bill color wasn’t 
>> different. Both birds had eyes clearly with the dark supercillium area, with 
>> the suspected Clark’s having some white in the lores. 
>> 
>> Thoughts? 
>> 
>> Regards, 
>> 
>> Mark Minner-lee 
>> Erie, CO 
>> 
>> Sent from my iPhone
> 
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[cobirds] News from Cherry Creek SP

[Robert Righter]

Hi all

Sitting on the Bob Rozinski memorial bench while over looking the pond on 
cottonwood creek, I was able to fill Bob in on what was going on. During our 
spiritual  conversation 25 species of birds made an appearance including all 
three of the regular occurring teal and even a Black-crowned Night-Heron 
swooped over the cattails and gave its friendly “wonk” greeting. I wish now I’d 
brought along my camera as I’m sure Bob would have offered some tips on how to 
reduce the blur in my photos. If you are out birding Cherry Creek SP and feel 
like a little company  stop by and sit on the Bob Rozinski bench and check in 
and be sure to bring your camera. 

Bob Righter
Denver CO

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[cobirds] Re: ID of Clark’s vs Western at Sterns Lake (Boulder County)

[Adam Vesely]

Mlodinow and Leukering (2018) wrote a fantastic and informative piece in 
Colorado Birds about identification of Western and Clark's Grebes along 
with thorough discussion of hybrids. Not sure if this link will work, but 
try this:

https://cobirds.org/Publications/ColoradoBirds/InTheScope/84.pdf

Adam Vesely
Thornton, CO 

On Sunday, April 11, 2021 at 11:20:26 AM UTC-6 Mark Minner-lee wrote:

> If anyone has been out to see the Western and possible Clark’s Grebes at 
> Stern’s Lake (Boulder County) I’d love some thoughts on how you determined 
> a Clark’s ID. Additional commentary also welcome from others who would like 
> to lend their expertise.
>
> The two grebes I saw both fit Western or Intermediate but not Clark’s. 
> Flanks on both birds were dark (suggesting Western). Bill color wasn’t 
> different. Both birds had eyes clearly with the dark supercillium area, 
> with the suspected Clark’s having some white in the lores.
>
> Thoughts?
>
> Regards,
>
> Mark Minner-lee 
> Erie, CO
>
> Sent from my iPhone

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[cobirds] Re: ID of Clark’s vs Western at Sterns Lake (Boulder County)

[John Malenich]

I think the photos of the WEGR and CLGR at Stern's Lake posted in Jason 
Cole's checklist linked below seem to illustrate what Caleb is describing 
here.  
https://ebird.org/checklist/S85225919

John Malenich
Boulder, CO 

On Sunday, April 11, 2021 at 11:33:19 AM UTC-6 caleb...@gmail.com wrote:

> Hi Mark!
>
> For the sake of efficiency, I'll be using WEGR to be Western Grebe and 
> CLGR to be Clark's Grebe.
>
> You would be correct that there is variation and therefore ambiguity when 
> it comes to the black and white pattern on the face. From my limited 
> experience, WEGR tends to be the species that has the most common variation 
> that brings facial IDs into the gray-zone, and it seems like most CLGR are 
> pretty straightforward. That being said, looking at a grebe from half a 
> mile away introduces issues, because we can't see every single bird with 
> close-up detail as we would like. The other primary mark that is probably 
> the most useful one to use year-round is the color pattern of the shoulder, 
> neck, and flanks.
>
> On WEGR, the black extends from the back of the neck to more of the base 
> of the neck, and that dark plumage (I say dark, because depending on the 
> age/molt/a bajillion random parameters, it can be black, or some shade of 
> gray) then goes down the shoulder close to the water. I've only been 
> birding for a few years, so take this with a grain of salt, but I've never 
> seen a WEGR in the field that did *not* have dark plumage extend down to 
> the shoulder that connected to the water. The dark plumage extends down the 
> flanks, so the bird just has a darker appearance. Where the body of the 
> bird meets the water on WEGR is usually dark plumage. On CLGR, there is 
> often much more white on the neck, and the black is restricted to the back 
> of the neck. The white then comes off the neck and down the shoulder, which 
> gives the entire front of the bird a much brighter, cleaner GISS. On adult 
> birds, that white/light gray extends down the flanks that are in contact 
> with the water. In most cases, you don't even *need* to see the head in 
> order to make an ID: dark shoulder always means WEGR, no need to wonder. If 
> where the body comes in contact with the water is pretty clearly white, 
> then that is most likely CLGR.
>
> All this being said, I should mention that WEGR x CLGR hybrids do occur 
> sometimes. They probably aren't super common, but I suppose it's never a 
> bad idea to consider this possibility in those situations when you see a 
> bird where all the marks are deep in the realm of ambiguity. I didn't talk 
> much about the bill, because although I'd imagine that's helpful on adult 
> birds in breeding plumage, I'm not sure how *reliable *of a mark that is. 
> Sure, CLGR tend to have brighter and cleaner yellow bills, and WEGR have 
> more dulled colored bills, but this is an even more unreliable mark to base 
> entire IDs off of. Just to name a few parameters that will be in constant 
> flux that can change the way a bill looks include lighting, feeding, and 
> age.
>
> Hope this was helpful in some way :) I'd be interested to hear what more 
> experienced birders do to identify the large grebes.
>
> *The birds are happy, and so am I*
> *~Caleb Alons, Larimer County*
>

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[cobirds] Re: ID of Clark’s vs Western at Sterns Lake (Boulder County)

[Caleb A]

Hi Mark!

For the sake of efficiency, I'll be using WEGR to be Western Grebe and CLGR 
to be Clark's Grebe.

You would be correct that there is variation and therefore ambiguity when 
it comes to the black and white pattern on the face. From my limited 
experience, WEGR tends to be the species that has the most common variation 
that brings facial IDs into the gray-zone, and it seems like most CLGR are 
pretty straightforward. That being said, looking at a grebe from half a 
mile away introduces issues, because we can't see every single bird with 
close-up detail as we would like. The other primary mark that is probably 
the most useful one to use year-round is the color pattern of the shoulder, 
neck, and flanks.

On WEGR, the black extends from the back of the neck to more of the base of 
the neck, and that dark plumage (I say dark, because depending on the 
age/molt/a bajillion random parameters, it can be black, or some shade of 
gray) then goes down the shoulder close to the water. I've only been 
birding for a few years, so take this with a grain of salt, but I've never 
seen a WEGR in the field that did *not* have dark plumage extend down to 
the shoulder that connected to the water. The dark plumage extends down the 
flanks, so the bird just has a darker appearance. Where the body of the 
bird meets the water on WEGR is usually dark plumage. On CLGR, there is 
often much more white on the neck, and the black is restricted to the back 
of the neck. The white then comes off the neck and down the shoulder, which 
gives the entire front of the bird a much brighter, cleaner GISS. On adult 
birds, that white/light gray extends down the flanks that are in contact 
with the water. In most cases, you don't even *need* to see the head in 
order to make an ID: dark shoulder always means WEGR, no need to wonder. If 
where the body comes in contact with the water is pretty clearly white, 
then that is most likely CLGR.

All this being said, I should mention that WEGR x CLGR hybrids do occur 
sometimes. They probably aren't super common, but I suppose it's never a 
bad idea to consider this possibility in those situations when you see a 
bird where all the marks are deep in the realm of ambiguity. I didn't talk 
much about the bill, because although I'd imagine that's helpful on adult 
birds in breeding plumage, I'm not sure how *reliable *of a mark that is. 
Sure, CLGR tend to have brighter and cleaner yellow bills, and WEGR have 
more dulled colored bills, but this is an even more unreliable mark to base 
entire IDs off of. Just to name a few parameters that will be in constant 
flux that can change the way a bill looks include lighting, feeding, and 
age.

Hope this was helpful in some way :) I'd be interested to hear what more 
experienced birders do to identify the large grebes.

*The birds are happy, and so am I*
*~Caleb Alons, Larimer County*

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[cobirds] ID of Clark’s vs Western at Sterns Lake (Boulder County)

[Mark Minner-lee]

If anyone has been out to see the Western and possible Clark’s Grebes at 
Stern’s Lake (Boulder County) I’d love some thoughts on how you determined a 
Clark’s ID.  Additional commentary also welcome from others who would like to 
lend their expertise.

The two grebes I saw both fit Western or Intermediate but not Clark’s.   Flanks 
on both birds were dark (suggesting Western).  Bill color wasn’t different.  
Both birds had eyes clearly with the dark supercillium area, with the suspected 
Clark’s having some white in the lores.

Thoughts?

Regards,

Mark Minner-lee 
Erie, CO

Sent from my iPhone

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Re: [cobirds] RE: {Bluebird-Babble} Bluebird dearth

[rebecca...@gmail.com]

CoBirders

On the outskirts of the box canyon where I live, in the early fall and 
early spring, there has been a flock of more than a dozen Western Bluebirds 
(at least for the past two years).  Last summer, we had two breeding pairs. 
This spring, there is but one, single bird.  I keep hoping that more will 
arrive, but I'm starting to lose that hope. 

Rebecca Laroche
Southern Colorado Springs







On Friday, April 9, 2021 at 12:34:41 PM UTC-6 5mcorp wrote:

> Cobirders -
>
> I'm still "wading" through the article referenced below 
> about the massive bird die-off that occurred last fall during migration amd 
> which was attributed for the most part  to the two largest recorded fires 
> ion Colorado;  EVER!
>
> I feel pretty confident when I conjecture that the dearth of bluebirds 
> during this spring's migration may be attributed to the the die-off 
> attributed to last fall's two major forest fires.  In other words, ther 
> population pf bluiebiords was hot severely by those fires, and there is 
> not the "normal" number of those birds available to comprise a "norrmal" 
> spring migration he on Colprado's Fronmt Ranmge.re 
>
>  Mass Bird Die-Off Linked to Wildfires and Toxic Gases
>
> *  
>  
> https://eos.org/research-spotlights/mass-bird-die-off-linked-to-wildfires-and-toxic-gases
>  
> *
>
>
> Bill Miller
>
> Fort Collins
>
>
>
> On Fri, Apr 9, 2021 at 8:51 AM Barbara Spagnuolo  
> wrote:
>
>> I can report, although informally, that I did not hear or see many 
>> bluebirds while I visited various nest boxes around Castle Rock for box 
>> maintenance & repair this season. In fact, despite visiting 14 different 
>> sites between the first week of March and yesterday (always on calm sunny 
>> days), I heard/saw bluebirds only twice. That is definitely very low 
>> compared to previous years. But I can also report more specifically that we 
>> found only 3 complete nests and 5 incomplete nests in our 190 nest boxes 
>> last week during the first week of monitoring, compared to 5 complete nests 
>> and almost a dozen incomplete nests during the first week of monitoring in 
>> 2020. We too have a very detailed monitoring program with extensive data 
>> keeping since 2007, so we will have a good opportunity for data comparison 
>> at the end of the season.
>>
>> -Barbara Spagnuolo, Castle Rock (Douglas County)
>>
>>  
>>
>> *From:* 'Hugh Kingery' via Bluebird-Babble  
>> *Sent:* Wednesday, April 7, 2021 5:50 PM
>> *To:* cob...@googlegroups.com; dougl...@googlegroups.com; 
>> bluebir...@googlegroups.com
>> *Subject:* {Bluebird-Babble} Bluebird dearth
>>
>>  
>>
>> We have not seen many bluebirds this spring, so I compared this year with 
>> the three prior years' data. This year we have seen only one or two of 
>> either species only once in a while. The last 3 years we saw them almost 
>> daily starting in mid-March.
>>
>>  
>>
>> This drop seems striking, at least along our road and on the trail we 
>> walk regularly. Have others noticed this pattern?
>>
>>  
>>
>> Hugh & Urling Kingery
>>
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>>  
>> 
>> .
>>
>> -- 
>>
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>>  
>> 
>> .
>>
>

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[cobirds] Big kettle of Turkey Vultures over Denver City Park

[Patrick O'Driscoll]

Just now, 40-plus Turkey Vultures sailed in and over from the southwest
corner @ 17th and York, heading northeast across the park into a stiff
breeze.

Patrick O’Driscoll
Denver

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[cobirds] Re: house wren arrival

[Janis Robinson]

I'm at 8000 feet in Coal Creek Canyon. Our wrens arrive around May 5 - 15, 
so it may be earlier down in Arvada.

Janis Robinson
Coal Creek Canyon
Jefferson County, CO

On Saturday, April 10, 2021 at 10:28:54 AM UTC-6 willi...@yahoo.com wrote:

> Can anyone tell me about when house wrens arrive in the Denver area?   Had 
> a pair nest here in Arvada in a bird box last year, and hoping they will 
> return.  Their song was a delight all summer.  

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[cobirds] Dinosaur Ridge - Denver Field Ornithologists (10 Apr 2021) 11 Raptors

[reports]

Dinosaur Ridge - Denver Field Ornithologists
Colorado, USA
Daily Raptor Counts: Apr 10, 2021
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SpeciesDay's CountMonth Total   Season Total
-- --- -- --
Black Vulture0  0  0
Turkey Vulture   1 29 32
Osprey   0  0  0
Bald Eagle   0  3 16
Northern Harrier 1  2  2
Sharp-shinned Hawk   0  9 23
Cooper's Hawk2 22 33
Northern Goshawk 0  3  7
Red-shouldered Hawk  0  0  0
Broad-winged Hawk0  1  1
Red-tailed Hawk  6 61254
Rough-legged Hawk0  0  1
Swainson's Hawk  0  3  3
Ferruginous Hawk 0  1  7
Golden Eagle 0  0  6
American Kestrel 0 16 18
Merlin   0  3  7
Peregrine Falcon 0  1  5
Prairie Falcon   1  2  3
Mississippi Kite 0  0  0
Unknown Accipiter0  1  2
Unknown Buteo0  6 15
Unknown Falcon   0  1  3
Unknown Eagle0  0  0
Unknown Raptor   0  0  3

Total:  11164441
--

Observation start time: 11:00:00 
Observation end   time: 14:00:00 
Total observation time: 3 hours

Official Counter:

Observers:Steve Ryder, Susan Blansett

Weather:
Clear skies today with very low relative humidity.

Raptor Observations:
One very light red-tailed hawk was possibly a Kriders. The northern harrier
very low and close to the ridge.

Non-raptor Observations:


Report submitted by DAVID HILL ()
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
http://www.dfobirds.org


More site information at hawkcount.org:  
https://hawkcount.org/siteinfo.php?rsite=123

Site Description:
Dinosaur Ridge is the only regularly staffed hawkwatch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Dinosaur
Ridge may be the best place in the country to see the rare dark morph of
the Broad-winged Hawk (a few are seen each spring). Hawkwatchers who linger
long enough may see resident Golden Eagles, Red-tailed Hawks and Prairie
Falcons, in addition to migrating Swainson's, Cooper's and Sharp-shinned
Hawks, American Kestrels and Turkey Vultures. Peregrine Falcons and
Ferruginous Hawks are uncommon; Northern Goshawk is rare but regular.
Non-raptor species include Rock Wren, and sometimes Bushtit, Western
Bluebird, Sandhill Crane, White-throated Swift, American White Pelican or
Dusky Grouse. Birders of any skill level are always welcome.  HawkWatch at
Dinosaur Ridge is generally staffed by volunteers from about 9 AM to around
3 PM from March 1st to May 7th.

Directions to site:
>From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow small signs from
the southwest end of lot to the hawkwatch site. The hike starts heading
east on an old two-track and quickly turns south onto a trail on the west
side of the ridge. When the trail nears the top of the ridge, turn left,
head through the gate, and walk to the clearly-visible, flat area at the
crest of the ridge.  (Distance: 0.56 miles, Elevation gain: 259 feet)


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