Dinosaur Ridge - Denver Field OrnithologistsColorado, USA
Daily Raptor Counts: Dec 24, 2022 |
Species | Day's Count | Month Total | Season Total |
Black Vulture | 0 | 0 | 0 |
Turkey Vulture | 0 | 0 | 0 |
Osprey | 0 | 0 | 1 |
Bald Eagle | 0 | 0 | 1 |
Northern Harrier | 0 | 0 | 1 |
Sharp-shinned Hawk | 0 | 0 | 2 |
Cooper's Hawk | 0 | 0 | 13 |
Northern Goshawk | 0 | 0 | 0 |
Red-shouldered Hawk | 0 | 0 | 0 |
Broad-winged Hawk | 0 | 0 | 1 |
Red-tailed Hawk | 0 | 0 | 22 |
Rough-legged Hawk | 0 | 0 | 0 |
Swainson's Hawk | 0 | 0 | 7 |
Ferruginous Hawk | 0 | 0 | 2 |
Golden Eagle | 0 | 0 | 11 |
American Kestrel | 0 | 0 | 10 |
Merlin | 0 | 0 | 0 |
Peregrine Falcon | 0 | 0 | 1 |
Prairie Falcon | 0 | 0 | 3 |
Mississippi Kite | 0 | 0 | 0 |
Unknown Accipiter | 0 | 0 | 0 |
Unknown Buteo | 0 | 0 | 1 |
Unknown Falcon | 0 | 0 | 1 |
Unknown Eagle | 0 | 0 | 0 |
Unknown Raptor | 0 | 0 | 1 |
Total: | 0 | 0 | 78 |
Observation start time: | 11:30:00 |
Observation end time: | 13:30:00 |
Total observation time: | 2 hours |
Official Counter | Ajit Antony |
Observers: | |
Visitors:7 hardy hikers walking the Hogback Trail.
Weather:Last Saturday I was doing a Christmas count in the Red Rocks area and our
leader Greg Goodrich mentioned my having found two Golden Eagle on my last
visit to Dinosaur Ridge, and hoping we would be able to add one of them to
pick up. I facetiously commented on the plenty of free time he seemed to
have in order to read my report which found no migrants. He said that
negative reports are important information. That is the reason I keep
going to the watch..
earth.nullschool.net showed the usual band of West winds in Southern
Wyoming and northern Colorado at 30 to 52 km/h, which should again
unfortunately push any migrants to the east of the watch.
https://drive.google.com/file/d/1WhrKiVQbuY7yyckh7hPJQCNQkAK5q8Te/view?usp=drivesdk
The green circle in the image denotes roughly the location of the hawk
watch. You can see the Great Salt Lake to the WNW, and a line drawn a
little above the south end of it and extended to the East roughly would be
the Wyoming Colorado border where you can see the strong winds .
There were Northwest winds predicted at the watch on
weather.gov for
Morrison CO, and while I know that this is not a guarantee of any migrants
whatsoever, as a sentimental nod to Northwest winds in the East which bring
in good migrants even in late December, I decided to go up to the watch
wearing crampons. Also the temperature was predicted to be 47°F with a
windchill of 43°F which could be bearable with 15 mph winds and even with
20 mph gusts.
Raptor Observations:In the 1st hour I saw 4 raptors far to the NE, 2 of them were much larger
than one which rose up and which I followed was an RT which kited a few
times over Green Mountain and which I then lost – seemingly a
non-migrant. When I went back to look at the larger presumed Eagles I could
not find them – probably dropped.
Much later I saw an RT kiting repeatedly over time into the wind to the NW
and I watched it to make sure that it was indeed hunting. Last year
counting at the I-84 Overlook Hawk Watch in New York we would see RT kiting
into strong NW winds and a hawk watcher would say "They're local" to which
I would say "Keep watching them" and invariably they would fly South. What
was happening was that while the the North component of the wind would push
them in the right direction, the West component would slow them down and
push them back, and these RT would be "resting" by kiting into the wind,
and then make another foray South, repeatedly kiting presumably to conserve
energy.
At 1:01 PM to the NNW I saw an adult Golden Eagle being harassed by a
Common Raven with 2 RT beside them. Of course I followed the GE which rose
up in the air at which point the RTs began escorting it out of their
territory by soaring ahead and behind it until it decided to fly West (when
they left it) and disappeared below the ridge against the pines beyond
I-70.
Non-raptor Observations:Townsend's Solitaire 1, Northern Flicker 1, House Finch 2.
Predictions:This is my last count at this site for fall 2022. My hypothesis as to why
this site has a good spring watch but not one in fall is not because of any
geographic factors e.g. the Cape May Peninsula "facing the wrong way" in
spring, but likely because of meteorological factors such as a band of very
strong winds in fall either from the West or NW at a little North of the
Colorado Wyoming border which likely push potential migrants to the East
where they, early in the season perhaps meet the Denver Convergence
Vorticity Zone and later in the season meet the presumed (with my limited
meteorological knowledge) the high-pressure zone around Denver further
pushing these Migrants east of Denver, bypassing the Dinosaur Ridge hawk
watch completely.
The hawk watch north of Denver which is further west is Commissary Ridge
Hawk Watch and one south of Denver is the Manzano Mountains HawkWatch
(where Emma Riley counted this fall) which is also West of Denver – both
of which have good fall raptor migrations. Presumably do they don't have
the aberrant and inhibitory winds that face this watch.
If Bryan Guarente the meteorologist at UCAR/The COMET Program reads this,
he may have an opinion to share.
Report submitted by DAVID HILL (
)
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
http://www.dfobirds.orgMore information at
hawkcount.org: [
Site Profile] [
Day Summary] [
Month Summary]
Site DescriptionDinosaur 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. Northern Goshawk is uncommon but also counted each season. Non-raptor
species include Rock Wren, Bushtit, Western Bluebird, Sandhill Crane,
White-throated Swift, American White Pelican, and Dusky Grouse. Birders of any
skill level are always welcome. The hawk watch at Dinosaur Ridge is staffed by a
Hawk Counter and volunteers from 9:30 AM to 5:30 PM from March 1st to May 14th,
weather permitting.
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)