Re: [cobirds] Parula and Prothontary on CU Boulder campus

[DAVID A LEATHERMAN]

Nathan et al,
The situation certainly has aphids at its core.  The sticky substance is aphid 
excrement called "honeydew".  The aphids suck sap from trees, utilize the 
nitrogenous compounds, excrete the sugars.  Many other creatures, mostly other 
insects, seek out the honeydew.  Yellowjackets, of which the black-and-white 
bald-faced hornet is one, seek the honeydew as food.  So do flies and many 
other insects.  The aphids and honeydew seekers are all eaten by birds.  I 
suspect the warblers are strictly after the aphid life forms present and are 
mostly unable to ingest the honeydew.  Earlier in late summer and the peak of 
fall migration, big flycatchers like pewees and kingbirds really go after 
wasps, especially honeydew-attracted yellowjackets.

Nice job Matt and Thomas.

Dave Leatherman
Fort Collins


From: cobirds@googlegroups.com  on behalf of Nathan 
Pieplow 
Sent: Monday, November 7, 2022 6:52 PM
To: cobirds 
Subject: [cobirds] Parula and Prothontary on CU Boulder campus

Hello all,

This morning, Matt Hofeditz found a Northern Parula on the CU campus, and later 
today Thomas Heinrich found a Prothonotary Warbler in the same tree with it. 
The two birds were seen together until dark.

Their favorite tree seems to be an oak with yellow leaves at the NE corner of 
parking lot 310, which is on the NE corner of Regent and Broadway in Boulder. 
Paid public parking is available at the Center for Community (C4C), which is 
just two buildings farther to the east on the north side of Regent.

As Dave Leatherman always reminds us, November warblers that hang out in the 
same area are always exploiting some kind of food source. This particular oak 
tree, like many oaks at this time of year, seems to have a sticky substance on 
its leaves that attracts hornets (and also rare warblers). I'll let Dave say 
what he thinks might be going on. But if the tree is feeding them well, these 
two warblers might hang around for a little while. Both birds venture to the 
surrounding trees as well.

For those who might come to Boulder County from elsewhere: the juvenile 
Yellow-crowned Night-Heron also continues at Pella Crossing park near Longmont. 
It hangs out around the NW corner of the easternmost pond, where it usually 
either hunkers down in the woody vegetation along the waterline, or else prowls 
the grass right next to the walking trail in plain sight.

Nathan Pieplow
Boulder

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[cobirds] Parula and Prothontary on CU Boulder campus

[Nathan Pieplow]

Hello all,

This morning, Matt Hofeditz found a Northern Parula on the CU campus, and
later today Thomas Heinrich found a Prothonotary Warbler in the same tree
with it. The two birds were seen together until dark.

Their favorite tree seems to be an oak with yellow leaves at the NE corner
of parking lot 310, which is on the NE corner of Regent and Broadway in
Boulder. Paid public parking is available at the Center for Community
(C4C), which is just two buildings farther to the east on the north side of
Regent.

As Dave Leatherman always reminds us, November warblers that hang out in
the same area are always exploiting some kind of food source. This
particular oak tree, like many oaks at this time of year, seems to have a
sticky substance on its leaves that attracts hornets (and also rare
warblers). I'll let Dave say what he thinks might be going on. But if the
tree is feeding them well, these two warblers might hang around for a
little while. Both birds venture to the surrounding trees as well.

For those who might come to Boulder County from elsewhere: the juvenile
Yellow-crowned Night-Heron also continues at Pella Crossing park near
Longmont. It hangs out around the NW corner of the easternmost pond, where
it usually either hunkers down in the woody vegetation along the waterline,
or else prowls the grass right next to the walking trail in plain sight.

Nathan Pieplow
Boulder

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[cobirds] Pueblo birds 11/6-7

[Brandon]

Quite a few highlights the last couple of days in Pueblo.

Chris Knight found a Sedge Wren at Valco Ponds on Nov 6th, also Swamp
Sparrows continue at Valco Ponds as well.  Adult Great Black-backed Gull is
back again, at South Shore Marina at Pueblo Reservoir, seen on Nov 6th and
7th.  Chris and I found a female Hooded Warbler on the Rock Canyon side of
the river, below the dam, on Nov 7th, other highlights in this area, two
Dunlin, Lesser Black-backed Gull, Harris's Sparrow, Common Yellowthroat,
Golden-crowned Kinglet, Say's Phoebe, and Ladder-backed Woodpecker.
Hopefully there are more surprises along the Arkansas River, in Pueblo.
November and December can be pretty exciting around here.

Brandon Percival
Pueblo West, CO

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[cobirds] Thursday, November 10th - Fort Collins Audubon Society hosts Marion Clement for “A Tiny Menace in the Forest: the Northern Saw-whet Owl”

[Andrew Monson]

 *Fort Collins Audubon* invites you to join a* virtual (and in-person watch 
party) program* featuring *Marion Clement*, Mexican Spotted Owl 
Coordinator, Bird Conservancy of the Rockies . Marion will be presenting* “A 
Tiny Menace in the Forest: the Northern Saw-whet Owl**” *on *Thursday, 
November 10th, 2022; Announcements at 7:00pm and Program at 7:20pm.*

*Virtual attendees: Enter the following link on your web browser at or 
before 7 p.m. and follow the instructions to join the meeting virtually: 
*
https://us02web.zoom.us/j/85330025573
*We will be enabling live closed-captioning for Zoom attendees to utilize 
as they wish.*

*In-person attendees: We will host a watch party at the Fort Collins Senior 
Center (1200 Raintree Dr). *

"A small owl with bright yellow eyes and long lashes, it’s no wonder the 
Northern Saw-whet Owl recently won Cornell Lab of Ornithology’s cutest owl 
award. Despite its undeniable charm, almost nothing is known about this 
common species. Since 1994, banding stations across North America are 
collaborating to shed light on this nocturnal predator. Due to the owl’s 
small size and nomadic behavior, banding recoveries are still our best tool 
for to understand the owl’s population trends, habitat needs, migration and 
breeding. There is still so much to discover.

Right above Fort Collins, Marion Clement runs one of the fall migration 
stations that catch, band and release Northern Saw-Whet Owls to contribute 
data to Project Owlnet.

Join Marion to learn about this owl, how this nationwide project began, and 
future steps we need to take to protect this owl.

JOIN US - The Public is Welcome! "
Andrew Monson
PR Chair, FCAS
Fort Collins, CO

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[cobirds] Yellow-crowned N Heron, Pella Crossing

[Alan Bell]

The YCN Heron was in the middle of the north shore of the east pond, seen from 
about 3:10 until 3:35. It was not on the shoreline, but up on the bank in short 
grass. Not visible from west shore, but first spotted from south shore, and 
then from the north shore trail. It was moving slowly 10’-15’ from the trail 
above the lower path. Unbothered either by me or passersby. I watched it about 
20 minutes catching 4-5 grasshoppers.

Also harrier flying over the pond.

Alan Bell
Boulder

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[cobirds] TWO Black Scoters, Adams County

[Susan Rosine]

Today I went searching for the Black Scoter and found ... Norm Erthal !
Norm found TWO Black Scoters with his scope. I was able to get some okay
photos of the two together and I'll add them to my checklist shortly.
Nice assortment of ducks and other birds around Cell 3 as well.
Thanks again to Adam Vesely for his initial report.
Susan Rosine
Brighton

On Sun, Nov 6, 2022, 12:56 PM Adam Vesely  wrote:

> Hi all,
>
> There is a Black Scoter at "Cell No. 3 (Willow Bay)" in Brighton, Adams
> County. Bird was in this general area and actively feeding:
>
> 39.961731, -104.848517
>
> Adam Vesely
> Thornton
>
>
>

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