Monday, 12 October 2026

[cobirds] Chatfield Banding Station: Week 7 Report

It was a hot and slow week at the Chatfield banding station! We banded 25 new birds of 7 species and recaptured 6 birds from this season. 

New Birds:
Black-capped Chickadee 2
Dark-eyed Junco 1
Downy Woodpecker 1
Orange-crowned Warbler 5
Ruby-crowned Kinglet 4
Song Sparrow 4
White-crowned Sparrow (Gambel's) 8

We have only 2 days of banding left for the season! You can register to visit through Denver Audubon’s website.

Audrey Hicks
Bander, Denver Audubon + Bird Conservancy of the Rockies



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Sunday, 11 October 2026

[cobirds] The Big Sit! at Chatfield State Park - Results

A huge, "Thank you," for all those that came out today (30+ people) and helped look for birds!  Even with the warm temperatures and windy conditions, the group tallied 62 species today…from ONE spot!  Below is the eBird Trip Report for the DFO event.

https://ebird.org/tripreport/583079

Some really nice birds were seen today.  Red-necked Grebe, Swamp Sparrow, Sabine’s Gulls(x4), Sandhill Cranes, American Pipit, Merlin(x2), and one Peregrine Falcon! 

This was the the 20th Chatfield Big Sit! that DFO has held and that I have hosted.   Usually this event has more species seen during inclement weather.  The highest species numbers were 72 species (two different years).  Nice weather yields fewer species (two years had only 52 species).  So, having 62 species today is pretty good!

Until next time... :-)

Joey.

Joey Kellner
Littleton, Colorado

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[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (11 Oct 2026) 12 Raptors

Mount Zion Hawk Watch at Windy Saddle Park
Golden, Greater Denver, Colorado, USA

To see hourly weather data and details of migrant raptors, look up this watch at hawkcount.org. This is a new raptor migration site identified and designated in mid-September 2024. This is Colorado's 1st fall hawk watch site, and the second hawk watch in Colorado. To get to the site which is along Lookout Mountain Rd. in Golden, enter either Windy Saddle Park or Mount Zion into Google Maps on your favorite navigation app, or enter the coordinates 39.7368,-105.2454. From the parking lot ascend the stone steps to the watch site. EVERYONE IS WELCOME TO THE HAWK WATCH TO ENJOY THE SPECTACLE OF RAPTOR MIGRATION, EVEN IF YOU KNOW NOTHING ABOUT IDENTIFYING RAPTORS IN FLIGHT. We will help you to learn Raptor ID if you are interested. See https://groups.google.com/g/cobirds/c/Oznn4uc6MBk

Daily Raptor Counts: Oct 11, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 0 21 269
Osprey 0 0 26
Bald Eagle 1 2 7
Northern Harrier 0 7 25
Sharp-shinned Hawk 0 10 29
Cooper's Hawk 5 56 236
American Goshawk 0 0 0
Broad-winged Hawk 0 7 109
Red-tailed Hawk 5 98 573
Rough-legged Hawk 0 0 0
Swainson's Hawk 0 5 194
Ferruginous Hawk 0 0 1
Golden Eagle 0 6 20
American Kestrel 0 12 141
Merlin 1 1 5
Peregrine Falcon 0 0 1
Prairie Falcon 0 0 2
Mississippi Kite 0 0 0
Unknown Accipitrine 0 1 4
Unknown Buteo 0 1 8
Unknown Falcon 0 0 0
Unknown Eagle 0 0 0
Unknown Raptor 0 5 15
Total: 12 232 1665


Observation start time: 09:00:00
Observation end time: 13:00:00
Total observation time: 4 hours
Official Counter Zak Hepler
Observers: Ajit Antony



Visitors:
We had many curious visitors at the watch today. Early in the morning, a young girl by the name Ruth was surprised to find out that "tiny speck" was an adult bald eagle. Ajit and Ruth discussed curvature of the Earth and why that would NOT be the reason for the 'small' bird. It is simply due to distance. One couple stayed for a long time painting. They wore aprons as they painted. The last visitors was a young couple from Tennessee and they both stated, in their own, that the love Red-tailed hawks. So, naturally, they became fast friends. The man even had a Red-tailed Hawk tattoo. Ajit and I spoke about the free Merlin app to many people and encouraged the young Tennessee couple to purchase some binoculars.

Weather:
Great morning weather conditions at Mount Zion. Cloud cover at 90% helped with raptor spotting. This cloud cover was largely gone by 11 AM MDT. The usual western winds became eastern winds as the clouds disappeared and the ground heated up. We had strong gusts coming from the East and Southeast. Almost blew over the scopes! Many lenticular clouds were present. Ajit and I spotted two very far east, past Denver. Lenticular clouds are formed by the western winds blowing over the tops of the Front Range. The far eastern lenticular clouds that we viewed were the same clouds made of the Front Range, but moved very far due to downstream wave propagation.

Raptor Observations:
A rather slow day, but a busy start. Between 10:30 AM MDT and 11 AM MDT, we had 5 migrants! The fast-moving Merlin was a treat to see. These birds move with purpose. The adult BE was seen near Green Mountain before heading southeast. Most migrants were spotted near Green Mountain today. Only one bird (CH) was spotted in the Kestrel Channel. Non-migratory raptors: 1 GE, 2 RT.

Non-raptor Observations:
Full eBird list for today found here: https://ebird.org/checklist/S401472737. We only had one WTSW today. It seems like these lovely birds have moved on. Mount Zion Hawk Watch is currently a good place to see and hear many Townsend's Solitaires.

Predictions:
Tomorrow will be a sunny day at Mount Zion. Reaching high 70s, we can expect zero rain, and southward winds up to 11mph. Be prepared for strong gusts. Migrant raptor numbers seem to be declining.


Report submitted by Zak Hepler (zakhepler@gmail.com)
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]




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Re: [cobirds] Corvids in unusual places

Much to our surprise, an Eastern Blue Jay is visiting our feeder in the Tarryall foothills above Tarryall Reservoir (9,400' elevation). It is hanging out with the Steller Jays. Photos to follow later.

Kelly Ambler
Jefferson, CO, Park County


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[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 10/11/26

A bit of excitement around 8 a.m. when a dozen White-crowned Sparrows got caught in net Z3.  Otherwise another slow day, with a total of 22 birds banded:

Ruby-crowned Kinglet 1
Hermit Thrush 3
Song Sparrow 2
White-crowned Sparrow, Gambel's 14
White-crowned Sparrow, Mountain 1
Dark-eyed Junco, Oregon 1

Closed tomorrow; looking forward to cooler weather on Tuesday!

We are open Tuesday through Sunday, weather permitting, through October 23.  Most weekday mornings there is a visitor session from 8 to 9 a.m., and on the weekends there are sessions at 8, 9 and 10 a.m. Reservations are needed; here is the link.   Please join us......It is a great year to visit Barr!

Meredith McBurney
Bander, Barr Lake Station
Bird Conservancy of the Rockies

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Saturday, 10 October 2026

[cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Report, 10/10/26

I have nothing new to say about unseasonably hot weather and very little bird activity!  Looking forward to a weather change this coming week!

9 birds banded today:

Ruby-crowned Kinglet 1
Hermit Thrush 4
Yellow-rumped Warbler, Audubon's 1
Song Sparrow 1
White-crowned Sparrow, Gambel's 2

We are open Tuesday through Sunday, weather permitting, through October 23.  Most weekday mornings there is a visitor session from 8 to 9 a.m., and on the weekends there are sessions at 8, 9 and 10 a.m. Reservations are needed; here is the link.   Please join us......It is a great year to visit Barr!

Meredith McBurney
Bander, Barr Lake Station
Bird Conservancy of the Rockies

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[cobirds] Mount Zion Hawk Watch at Windy Saddle Park (10 Oct 2026) 12 Raptors

Mount Zion Hawk Watch at Windy Saddle Park
Golden, Greater Denver, Colorado, USA

To see hourly weather data and details of migrant raptors, look up this watch at hawkcount.org. This is a new raptor migration site identified and designated in mid-September 2024. This is Colorado's 1st fall hawk watch site, and the second hawk watch in Colorado. To get to the site which is along Lookout Mountain Rd. in Golden, enter either Windy Saddle Park or Mount Zion into Google Maps on your favorite navigation app, or enter the coordinates 39.7368,-105.2454. From the parking lot ascend the stone steps to the watch site. EVERYONE IS WELCOME TO THE HAWK WATCH TO ENJOY THE SPECTACLE OF RAPTOR MIGRATION, EVEN IF YOU KNOW NOTHING ABOUT IDENTIFYING RAPTORS IN FLIGHT. We will help you to learn Raptor ID if you are interested. See https://groups.google.com/g/cobirds/c/Oznn4uc6MBk

Daily Raptor Counts: Oct 10, 2026
Species Day's Count Month Total Season Total
Black Vulture 0 0 0
Turkey Vulture 0 21 269
Osprey 0 0 26
Bald Eagle 0 1 6
Northern Harrier 0 7 25
Sharp-shinned Hawk 0 10 29
Cooper's Hawk 1 51 231
American Goshawk 0 0 0
Broad-winged Hawk 0 7 109
Red-tailed Hawk 8 93 568
Rough-legged Hawk 0 0 0
Swainson's Hawk 0 5 194
Ferruginous Hawk 0 0 1
Golden Eagle 1 6 20
American Kestrel 1 12 141
Merlin 0 0 4
Peregrine Falcon 0 0 1
Prairie Falcon 0 0 2
Mississippi Kite 0 0 0
Unknown Accipitrine 0 1 4
Unknown Buteo 0 1 8
Unknown Falcon 0 0 0
Unknown Eagle 0 0 0
Unknown Raptor 1 5 15
Total: 12 220 1653


Observation start time: 08:30:00
Observation end time: 11:00:00
Total observation time: 2.5 hours
Official Counter Ajit Antony
Observers: Liza Antony



Visitors:
7 hikers asked whether we were bird watching and we explained. One wanted to know if hawks migrate singly, and I explained the massive kettles of BW and SW currently going through Veracruz. 3 young men were interested in what we were looking with our telescope and I explained. They were very interested and asked numerous questions - they did not know that hawks migrated. They wanted to know if this was a job or a hobby, and I explained that I have been counting migrant hawks longer than they were even thought of - 40 years, even while I was working as a physician in New York State, and for the past 5 years in Colorado.

Weather:
There was a weak inversion layer over Denver with mild haziness, 40% cloud cover dropping to 25% - altocumulus to the East dissipated by the next hour with the low humidity of 10%, and cumulus to the immediate west of the watch which came over to the NE & SE and overhead which we scanned with binoculars regularly but did not find any migrant hawks. Clouds, in addition to making finding hawks easily is supposed to keep the thermalns at a lower level, however the Soaring Forecast of the NWS predicted excellent lift at 21 ft/second with height of thermals at 14,982 ft above ground level AGL by 10:45 a.m. MDT i.e. 1.5 miles above the watch! The winds aloft were from the SW.

Raptor Observations:
The first raptor was a local RT at 10:04 a.m. and the first migrant was an RT at 10:18 a.m. At 10:28 a.m. we saw a GE easily visible to the naked eye flying in from the North along Clear Creek Canyon and Rising progressively soaring to the SW until it was barely visible and seemed like a migrant. It had some white to the base of its "split tail" which is black central adult feathers and white on the sides, indicating a Basic III, Liza kept following it assiduously, eventually deeming it a non-migrant as it flew NW, taking about 6 minutes in all. Again like yesterday most of the migrant action was over Lookout Mountain with few along other channels we usually see migrants on.

Non-raptor Observations:


Predictions:
There is a cold front going through Denver so it may be good for migrant hawks tomorrow. Cloudy, then gradually becoming mostly sunny, with a high near 81. West southwest wind around 6 mph becoming light and variable. Winds could gust as high as 16 mph after 2:00 p.m. The winds aloft are expected to be from the SW and South.


Report submitted by Ajit Antony (aiantony@earthlink.net)
More information at hawkcount.org: [Site Profile] [Day Summary] [Month Summary]




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