[cobirds] Bird Conservancy of the Rockies - Chatfield Banding Station, 5/23 & 24/21

[Meredith McBurney]

Yesterday (5/23) continued the trend of a variety of species led by Yellow 
Warbler and Catbirds.  We banded a total of 27 new birds:

Willow Flycatcher 1
Dusky Flycatcher 3
Blue-gray Gnatcatcher 1 (FOS)
Gray Catbird 7
Yellow Warbler 7
MacGillivray's Warbler 1
Common Yellowthroat 2
Wilson's Warbler 3
Song Sparrow 1
Lincoln's Sparrow 1

Today (5/24) the numbers dropped down again to the mid-teens, which was a 
disappointment - we had thought perhaps we would be seeing more birds 
arriving late.  We had our first Warbling Vireo of the season, 2+ weeks 
late.  The best catch of the day was a male Bullock's Oriole that was 
banded in 2015.

Warbling Vireo 1
Gray Catbird 4
Yellow Warbler 1
MacGillivray's Warbler 1
Wilson's Warbler 2
Yellow-breasted Chat 1
Green-tailed Towhee 1
Lincoln's Sparrow 2
Mountain White-crowned Sparrow 1
Bullock's Oriole 1, banded 2015

We are open six days per week (closed Tuesdays) through May 30, weather 
permitting.  While some COVID related restrictions remain in place there 
are opportunities most mornings for the public to visit, but reservations 
are required. Visit https://denveraudubon.org/events/ 

 for 
more information and to sign-up.  Because each hour-long session is limited 
to 10 people, we anticipate selling out most mornings, so register soon if 
you are interested.

Meredith McBurney
Bander, Chatfield Station
Bird Conservancy of the Rockies

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[cobirds] Boulder Audubon - This Tuesday - The Natural History Bats

[Sydney Rayl]

*Online Meeting - Bringing the Natural History of Boulder County Bats to 
Light*

The true nature of bats is often eclipsed by mythology and weakly inferred 
links to zoonotic diseases, including COVID-19. After more than 30 years of 
research in Boulder County, every year brings new and compelling 
information on our magnificent nocturnal friends. At Boulder County 
Audubon's final program of the Spring 2021 season, we will discuss this 
along with the current research findings on bats in Boulder County 
including increasing populations of a recently established species, the 
tricolored bat; new findings on bat winter ecology; and how climate warming 
is affecting our local populations and their reproductive efforts. We will 
also learn more about a newly discovered link between bats and black-tailed 
prairie dog colonies in the foothills. 

*Join Boulder County Audubon this Tuesday* to delve into the nocturnal and 
enigmatic world of bats with Rick Adams. Rick Adams is Professor Emeritus 
at the University of Northern Colorado and Founder/President of the 
Colorado Bat Society.

*When: This Tuesday, May 25, 7:15 pm. *We encourage you to join early if 
possible (the Zoom room will open at 7:00) to ensure there are no 
connection issues.

*Where:* This meeting will be held online over Zoom. All participants will 
be muted upon entry, but the chat feature will be available so you can type 
questions for the speaker. Follow *this link  
*on Tuesday, May 25 to 
access the Zoom link.

*We hope to see you there!*

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[cobirds] Banding, Alder Flycatcher, CSR, El Paso Co, Mon

[Steven Brown]

Hi COBirders,

This morning was cool, calm, and clear - very nice, and there was a good 
arrival especially of small birds that lasted until about 1030. 43 birds banded 
of 15 species, 24 warblers, my best banding day of the year. Early it was all 
warblers and flycatchers, and later more of the bigger birds started to show up.

Including:
W Wood Pewee, 2 AD
Willow Flycatcher, 2 SY (Second Year)
Alder Flycatcher, SY
Gray Catbird, 2 - Ad & SY
Brown Thrasher, Ad M (with a HUGE cloacal protuberance!  - that means he 
packing a lot of sperm)
Yellow-breasted Chat, 2 SY
Lincoln’s Sparrow, 3 SY
MacGillivray’s Warbler, 2 SY F, 3 SY M
Com Yellowthroat, SY F, 2 SY M
Yellow Warbler, 7 SY M, 5 SY F
Wilson’s Warbler, 3 SY M, 1 SY F
Bullock’s Oriole, Ad M, Ad F, SY M

Yeah, this is fun.
Steve Brown
Colo Spgs



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[cobirds] New Nunn-area Arrivals/Weld

['The Nunn Guy' via Colorado Birds]

Hi all

Northern Mockingbird showed in yard this morning singing up a storm. 
Western Wood-Pewee yesterday. Blue Grosbeak at local "grassland bird haven" 
in and around CR 102/100/41-area. The gravel pit trees at CR 94/37 are 
noisy with usual breeding birds--sometimes you can get three oriole species 
here :-)

Most non-breeding shorebirds have since moved on for the most part.

Some photos below.

Thanks Gary Lefko, Nunn
http://www.friendsofthepawneegrassland.org
https://www.inaturalist.org/projects/birds-and-more-of-the-pawnee-national-grassland

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[cobirds] Baltimore oriole AND red-necked grebe, Boulder - Pella Crossing

[Laura Steadman]

Hi birders!

The Baltimore oriole previously reported on the west side of Pella Crossing
open space was still present and singing this morning. Also of potential
interest is a breeding plumage red-necked grebe in the pond just north of
the parking lot.

Good birding,
Laura Steadman
Boulder

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[cobirds] Indigo Buntings Chautauqua Park, Boulder

[janeb1952]

Two gorgeous Indigo Buntings in the meadow just past the cottages on Bluebell 
Road, singing away.
Jane Baryames 


Sent from my iPhone

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[cobirds] Chimney Swifts and Lesser Nighthawk at Totten Reservoir (Montezuma County)

[Eric Hynes]

Good Morning CO Birders,

Yesterday evening I was standing on the bluff on the east side of Totten
Reservoir at 1800, just outside Cortez, and was about to leave when a
Chaetura sp. buzzed by me. I almost dropped my scope. This may not seem
like a big deal to CO birders closer to Kansas, but for us who are closer
to Utah, a small, dark swift is terribly exciting.

In short order, I was joined by Erik Hendrickson, then Brenda Wright and
Coen Dexter. We stayed until nearly dark and managed to see this swift a
number of times. We took thousands of photos, some of which had the swift
in it. It was joined by a second Chaetura sp. and at one of the times they
were together, flying directly over us, all four of us heard a few seconds
of rapid, flat tweetering chatter... Chimney Swift! It is a sound I am very
familiar with, having grown up in New England. I played Vaux's Swift off my
phone after hearing the birds and we all agreed, it was not the sharper,
sweeter Pygmy Nuthatchesque squeaks of a Vaux's Swift. PHEW! We were all
greatly relieved to hear it. We had spent a lot of time discussing the
finer points of Chimney versus Vaux's ID based on field marks and found
ourselves about as confident as a person on thin ice (until it/they
called). We called them both Chimney Swift because we could not discern any
difference between them proportionally.

At sunset, we added a very good look at a solo Black Swift and noted the
larger size and the decidedly different structure and flight behavior.

Since we had stayed until sunset, we gave it a few more minutes because
Brenda and Coen had a Lesser Nighthawk at this same spot recently. On cue,
a Lesser Nighthawk started coursing back and forth along the slope below
us. In short order it was joined by a second Lesser Nighthawk and then a
Common Nighthawk, which made for great comparison.

Overall, a fantastic evening and enough excitement to keep me sharp dodging
Elk on my drive back up to Telluride. Brenda shared the eBird checklist
already, which I hope to add to later today. Check it out here:
https://ebird.org/checklist/S88891726

Best,
Eric
.
Eric Hynes
Telluride, CO
-
Box Canyon Birding
boxcanyonbirding.com
-
Field Guides Birding Tours
www.fieldguides.com

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