Dinosaur Ridge - Denver Field Ornithologists Colorado, 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.org More site information at hawkcount.org: https://hawkcount.org/siteinfo.php?rsite=123 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. 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) -- -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to cobirds@googlegroups.com For more options, visit this group at http://groups.google.com/group/cobirds?hl=en?hl=en * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ --- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscr...@googlegroups.com. 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