[cobirds] Red-necked Grebe, Park County

[Nathan Pieplow]

Andrew Spencer and I got in some decent birding in Park County before the
rain started this morning. The highlight was a breeding-plumaged Red-necked
Grebe at Antero Reservoir. We also saw a trio of Hooded Mergansers at
Eleven Mile Reservoir.

On the way home we headed north from Woodland Park. In Douglas County we
found a large flock of dozens of Evening Grosbeaks -- family groups with
adults and lots of begging young. It was really interesting to see how the
juvenile plumage of males differs from the juvenile plumage of females --
it was quite easy to tell them apart. Neither of us had ever heard or
recorded the begging calls of the species before. Most renditions sound
like a lower, softer, finer version of the trill call of adults.

Happy birding,

Nathan Pieplow
Boulder

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[cobirds]

[bbeatty7704]

I was at  Chatfield the other day, and saw an adult cedar waxwing feeding a
fledgling.  

 

Brenda Beatty

Sedalia, CO

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[cobirds] Re: Broad-winged Hawk adult & juvenile, Boulder

[Bob Spencer]

We had very good looks this morning of the adult Broad-winged Hawk from the 
Centennial Trail parking lot at the mouth of Sunshine Canyon, Boulder. The 
hawk was perched for a long time on top of a pine tree across the road from 
the parking lot.

Bob Spencer and Sondra Bland
Erie, CO

On Monday, July 20, 2020 at 8:49:06 PM UTC-6, Nathan Pieplow wrote:
>
> This evening I was hiking at the mouth of Sunshine Canyon in Boulder when 
> I heard the whistled "Pee-tee" call of a Broad-winged Hawk. After looking a 
> bit I saw a juvenile Broad-wing perched in a stand of narrowleaf 
> cottonwoods. The unseen adult was calling from somewhere else in the stand. 
> Broad-winged Hawks breed in small numbers on the Front Range but it's 
> always exciting to run into a family group.
>
> This was only about 100 yards up Sunshine Canyon Road from the Mt. Sanitas 
> Trailhead.
>
> https://ebird.org/checklist/S71684131
>
> Nathan Pieplow
> Boulder
>

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[cobirds] Red Crossbill at Littleton, Arapahoe Co

[David Suddjian]

A Type 2 *Red Crossbill* passed over St. Mary Catholic Church grounds along
South Prince in Littleton this morning, moving west. There are no other
crossbill reports showing for Arapahoe County in 2020 in eBird, so I
thought it worth mentioning here.

David Suddjian
Littleton, CO

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Re: [cobirds] Shorebirds: Lagerman Res. Boulder Cty

[Bryan Guarente]

Peter (and COBirds),
Why might it be that there were new migrants at Lagerman Reservoir this
morning?  And why might they be shorebirds from the Arctic Tundra?  If you
can't read through my thinly veiled questions, the answer is the wind
pattern.

https://earth.nullschool.net/#2020/07/26/1500Z/wind/isobaric/850hPa/orthographic=-105.64,40.13,1820/loc=-105.110,40.203

Here are the 850mb winds from earth.nullschool.net to help you answer that
question.  If you follow the streamlines from Longmont (green circle)
backwards, you will get a sense of why there were shorebirds coming from
the Arctic Tundra into our area.  The winds converged over the Longmont
area.  To the south of Longmont, the winds were still pushing to the north,
while the winds north of Longmont were streaming in from the Arctic.  Makes
for a simple example of migrants driven by weather patterns.

As for another thought about dispersal of migrants from the south, with the
landfall of Hanna and the subsequent rainfall and impacts, you might want
to look for birds here in CO ahead of that system.  There is a large high
pressure system to the east that is driving Hanna inland as well as drawing
winds into southern CO from the south into Mexico.  This is the time of
year where we can start to see strange dispersals of rarities (Painted
Redstart comes to mind for me, but isn't likely from the current source
region of these winds).  So keep your eyes peeled for hurricane-driven
birds into CO, specifically the eastern slope from central to southern CO.

Thanks for the quick note.
Bryan

Bryan Guarente
Meteorologist/Instructional Designer
UCAR/The COMET Program
Boulder, CO


On Sun, Jul 26, 2020 at 9:42 AM Peter Burke  wrote:

> Good shorebirds at Lagerman Reservoir this morning including 18 Wilson’s
> Phalarope, several LB Dowitcher, and at least a dozen more peeps.
>
> Peter Burke
> Boulder
> --
>
>
>
> Peter Burke
>
> 7988 James Court Niwot, CO 80503
>
> (973) 214-0140
>
> Flickr   LinkedIn
> 
>
>
>
> --
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> 
> .
>

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[cobirds] Shorebirds: Lagerman Res. Boulder Cty

[Peter Burke]

Good shorebirds at Lagerman Reservoir this morning including 18 Wilson’s
Phalarope, several LB Dowitcher, and at least a dozen more peeps.

Peter Burke
Boulder
-- 



Peter Burke

7988 James Court Niwot, CO 80503

(973) 214-0140

Flickr   LinkedIn


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