Saturday, 2 May 2026

[cobirds] Dinosaur Ridge - Denver Field Ornithologists (02 May 2026) 9 Raptors

Dinosaur Ridge - Denver Field Ornithologists
Golden, Colorado, USA

Daily Raptor Counts: May 02, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 2 9 171
Osprey 0 2 66
Bald Eagle 0 1 28
Northern Harrier 0 1 51
Sharp-shinned Hawk 1 4 199
Cooper's Hawk 1 8 257
American Goshawk 0 0 2
Red-shouldered Hawk 0 0 0
Broad-winged Hawk 0 14 94
Red-tailed Hawk 1 7 469
Rough-legged Hawk 0 0 0
Swainson's Hawk 0 0 52
Ferruginous Hawk 0 0 17
Golden Eagle 0 0 8
American Kestrel 4 6 702
Merlin 0 0 7
Peregrine Falcon 0 0 10
Prairie Falcon 0 0 4
Mississippi Kite 0 0 0
Unknown Accipitrine 0 0 22
Unknown Buteo 0 0 5
Unknown Falcon 0 0 5
Unknown Eagle 0 0 0
Unknown Raptor 0 1 6
Zone-tailed Hawk 0 1 1
Total: 9 54 2176


Observation start time: 09:00:00
Observation end time: 17:00:00
Total observation time: 8 hours
Official Counter Soren Zappia
Observers:



Visitors:
15 visitors, not including one field trip. We had a troop of Girl Scouts visit us this morning! We learned about the local birds, observed bird behavior, and learned about our research and equipment. Thank you to Janet Peters for leading this trip!

Weather:
It was a warm sunny day with a pleasant southeast wind at 1-3 bft. Temperatures ranged from 64-70 F. There were no clouds overhead, although late in the day we had a few clouds to the west.

Raptor Observations:
Today's pace was slower than yesterday, with 9 total birds. A young Cooper's Hawk flew past the ridge close by in the morning, and we saw a juvenile Red-tailed Hawk glide north fairly low overhead, but the remainder of the birds were distant to the west. Many local Turkey Vultures were taking advantage of the sun and we saw multiple small groups roaming about. At one point we had two migrant TVs head directly north. In the afternoon we also had a local Cooper's Hawk land in a tree on the ridge, giving us great views. We also counted our 700th American Kestrel of the season today! They have been our most numerous migrants this season and last year.

Non-raptor Observations:
White-throated Swift 3, Broad-tailed Hummingbird 4, Mourning Dove 2, Downy Woodpecker 1, Say's Phoebe 1, Blue Jay 1, Woodhouse's Scrub Jay 2, Common Raven 2, Black-capped Chickadee 1, Tree Swallow 3, Violet-green Swallow 2, Northern Rough-winged Swallow 1, Barn Swallow 1, Rock Wren 1, Blue-grey Gnatcatcher 1, House Finch 2, Chipping Sparrow 1, Spotted Towhee 1, Western Meadowlark 2

Predictions:
Tomorrow, mostly cloudy to overcast skies are predicted with temperatures in the mid 60s to low 70s F. Light winds from the SW are expected.


Report submitted by Official Counter of the day shown above (dinoridgehw@gmail.com)
Dinosaur Ridge - Denver Field Ornithologists information may be found at: www.dinosaurridgehawkwatch.org
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]
Count data submitted via Trektellen.org - [Project Details]




Site Description
Dinosaur Ridge is the only regularly staffed hawk watch in Colorado and is the
best place in the world to see migrating Ferruginous Hawks. Hawk watchers may
see 17 species of migrating raptors; and it is an excellent site to see rare
dark morph buteos including Broad-winged hawk, Swainson's hawk, Ferruginous
hawk, Rough-legged hawk and Red-tailed Hawk. Other raptors we see include Golden
and Bald Eagles, Northern harrier, Osprey, Peregrine Falcons, Prairie Falcons,
Cooper's and Sharp-shinned Hawks, American Kestrels, Merlin, and Turkey
Vultures. American Goshawk is uncommon but also counted each season. Non-raptor
species include Rock Wren, Bushtit, Western Bluebird, Sandhill Crane,
White-throated Swift, and American White Pelican. Birders of any skill level are
always welcome. The hawk watch at Dinosaur Ridge is staffed by Hawk Counter(s)
and volunteers from March through early May.

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 hawk watch signs from the
southwest end of the parking lot to the hawk watch 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, and walk to
the flat area at the crest of the ridge. (Distance: 0.56 miles, Elevation gain:
259 feet)

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[cobirds] Kentucky Warbler, Del Norte, Rio Grande Co.

Hi all, 

A few hours ago, I photographed a KENTUCKY WARBLER at the Del Norte Town Park in the San Luis Valley. It was calling actively in the willows here (37.6858849, -106.3539172). Will do a longer trip report in a few days but wanted to get the word out on this bird as soon as possible.

Jack Bushong
Louisville, CO

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[cobirds] Re: Blackburnian Warbler Las Animaa

Kentucky warb same spot as the worm eating 

On Fri, May 1, 2026 at 3:45 PM Luke Pheneger <phenegerluke@gmail.com> wrote:
Worm Eating Warbler here 
(37.3977301, -104.6569238)

On Fri, May 1, 2026 at 2:26 PM Luke Pheneger <phenegerluke@gmail.com> wrote:
Tennessee Warbler same spot as Blackburnian 

On Fri, May 1, 2026 at 2:09 PM Luke Pheneger <phenegerluke@gmail.com> wrote:
Hi All,

Pablo Quezada and I just had a female Blackburnian Warbler in the town of Aguilar. The exact coordinates are here: 
(37.4001174, -104.6533105)

Also present in town was a Nashville Warbler and a female redstart. Overall great migrant numbers today.

At Lathrop SP (Huerfano) we had 4 Northern Parulas and a Northern Waterthrush. 

Luke Pheneger 

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[cobirds] SE Colorado (Prowers and Bent) 5/2

Kara Carragher, Dan Follett, and I birded Lamar hotspots (Prowers County) and Melody Tempel Grove (Bent County) today.

At Riverside Cemetery in Lamar the continuing (day 3) male Hooded Warbler and newly arrived male and female Rose-breasted Grosbeaks were the highlights.  

At Fairmount Cemetery in Lamar, the continuing from yesterday singing male Northern Parula and singing Least Flycatcher were joined by an adult singing male BLACKBURNIAN WARBLER, certainly our highlight of our day.

Up at Melody Tempel Grove, we saw a singing male Hooded Warbler and a female Hooded Warbler (my 3rd and 4th Hooded Warblers in two days in SE Colorado), and a singing Tennessee Warbler.

A pretty fun day of birding for sure.

Brandon K. Percival
Currently in Lamar, CO

Sent from my Phone

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[cobirds] test Wood Duck image

I hope I did this correctly:

Inserted (not an attachment) a wood duck photo as per CoBirds guidelines.  

Wood Duck Boulder Creek Jan 2026 6 signed copy.jpg

Male Wood Duck from January 2026 along Boulder Creek.  This guy was with 11 other wood ducks along the Boulder Creek bikeway near the Bandshell.  Relatively shy, but not overly so.  

John T (Tumasonis) 

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Uploaded Image

[cobirds] Hudsonian Godwits Kiowa

Two at Neenoshe here: 
(38.3379433, -102.6901112)
Also Piping Plover present.


Luke Pheneger 

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[cobirds] eclipse plumage, etc.

Hey, all.

First off, thanks for the great Mexican Duck conversation. The take-home message, at least as I am receiving it, is: Let's get out there and document Mexican Ducks, candidate Mexican Ducks, Mexican–like ducks, and whatnot. Brilliant. Bring it on. Together we'll advance our knowledge of the status & distribution of diazi genes in Colorado.

With that out of the way, this, from Tony:

"Finally, a little bit of a deviation from the subject: A plea to birders to quit using the phrase 'eclipse plumage.' Ducks are no different from all other Colorado species in conducting a substantial molt as adults after breeding. There is no reason to call the post-breeding molt of Mallards one thing and that of Yellow-rumped Warblers... and Spotted Sandpipers, Bobolinks, Swainson's Hawks, California Gulls, and Lazuli Buntings another thing. The only real difference is that ducks hold that 'Basic Plumage' for a much shorter portion of the calendar year. But it's the same molt.'"

So, unless there's been a big recent disclosure that I'm not aware of (could be!), that's not right. It's *not* the same molt. Contra everything we were taught in the benighted 20th century, the "dull plumage" (Tony, I'm doing your bidding, but see below ðŸ˜ˆ) in most Colorado ducks, is in fact the *alternate* plumage. Not the basic plumage. Here is a link to Peter Pyle's seminal 2005 paper on the topic:

birdpop.org/docs/pubs/Pyle_2005_Molts_and_Plumages_of_Ducks.pdf

Okay, now let's talk about that "dull plumage." The eclipse plumage. (Leukering prepares to commit self-defenestration...) If I'm hearing Tony right, I fully & completely agree with half of what he is saying, viz., that it is an excellent idea to understand molts & plumages. For starters, it's pragmatic: Such knowledge can be valuable in identifying birds to species. It is also essential for even beginning to attempt to age birds correctly. (Which, to complete the circle, brings us back to species-level identification. Because you can't identify summer dowitchers in Colorado without first knowing how old they are, which requires an assessment of molts & plumages).

That said, I don't object to the term "eclipse plumage." We have all sorts of taxon-specific phraseology like that. Hawks have eyries, and herons have rookeries; but we we don't have similar words, as far as I am aware, for the nests of shrikes and blackbirds. Formative kittiwakes are tarrocks, and fledgling turkeys are poults; but we don't have similar words for, say, loons and woodpeckers. The progeny of Callipepla squamata x C. gambelii are Scrambled Quail; but we don't have an analogous name for the hybrid young of presumptive Mourning x MacGillivray's warbler pairings. Words like eyrie, tarrock, and Scrambled don't get in the way of understanding "nest," "formative," and "hybrid," and I don't think "eclipse" gets in the way of understanding that the dull plumage of most Colorado waterfowl is, surprisingly, the alternate plumage.

Ted Floyd
Lafayette, Boulder Co.

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