Date: 4/10/17 9:03 pm
From: <reports...>
Subject: [cobirds] Dinosaur Ridge - Bird Conservancy of the Rockies (10 Apr 2017) 19 Raptors
Dinosaur Ridge - Bird Conservancy of the Rockies
Colorado, USA
Daily Raptor Counts: Apr 10, 2017

Species Day's Count Month Total Season Total
------------------ ----------- -------------- --------------
Black Vulture 0 0 0
Turkey Vulture 4 17 17
Osprey 0 1 1
Bald Eagle 0 3 12
Northern Harrier 0 0 0
Sharp-shinned Hawk 2 10 20
Cooper's Hawk 2 18 23
Northern Goshawk 0 0 0
Red-shouldered Hawk 0 0 0
Broad-winged Hawk 1 1 1
Red-tailed Hawk 5 28 208
Rough-legged Hawk 0 0 0
Swainson's Hawk 2 2 2
Ferruginous Hawk 0 1 6
Golden Eagle 0 0 3
American Kestrel 2 10 22
Merlin 0 0 0
Peregrine Falcon 1 2 4
Prairie Falcon 0 1 2
Mississippi Kite 0 0 0
Unknown Accipiter 0 1 5
Unknown Buteo 0 2 17
Unknown Falcon 0 1 4
Unknown Eagle 0 0 0
Unknown Raptor 0 1 8

Total: 19 99 355

Observation start time: 08:00:00
Observation end time: 13:30:00
Total observation time: 5.5 hours

Official Counter: Joyce Commercon


Surprisingly few people were on the nice, dry trail today. A few came up
for the view. One couple with their dog came up early in the morning to
chat. Returning, after their hike, they mentioned having seen what was
likely a Turkey Vulture south on the Ridge, as well as having spotted some
newly-blooming Golden Banner and Larkspur wildflowers.

The day was sunny with a slightly hazy, nearly featureless blue sky that
eventually produced a few cottony clouds to the west in the afternoon. It
would have been almost warm (7 C to 12 C) except for the near-constant
breezes (bft 2-3) from the southeast. Visibility was acceptable but a bit
hazy in the valleys at distance, even in the morning. The few contrails
that did form dissipated rapidly.

Raptor Observations:
During two 15-minute-long bursts of migrant activity in the first two hours
of the watch, all but one of the migrants passed along the western valley
or western ridges. The flow of migrants became more evenly spaced time-wise
and eventually slowed during the next hours of the watch; most of these
later migrants passed over Dinosaur Ridge. It is possible with the
featureless blue sky that some high-flying migrants were missed in the
afternoon. Observing a couple of migrating Swainson’s Hawks is always
pleasing, but the highlight of the day was a good view of an adult
Broad-winged Hawk, spotted kettling up with a Cooper's Hawk and some
Red-tailed Hawks over the western valley. The highlight of the local raptor
activity was catching the finale of a tussle between a local adult
Red-tailed Hawk and an immature (possibly sub-adult III) Bald Eagle that
took place south of HawkWatch overtop the Ridge; the Bald Eagle flipped
upside down to defend itself against the Red-tailed Hawk's attack from
above. They then parted with the hawk going east and the eagle heading

Non-raptor Observations:
Early in the watch, a Broad-tailed Hummingbird zinged over the platform.
Several groups of 10 to 15 White-throated Swifts were seen flying (mostly
northward) along the Ridge and valleys as well as over WestRidge and at
Cabrini. A lone Cliff Swallow flew about for a while over the western
valley, eventually heading southwards. Also seen or heard were Western
Meadowlark, Townsend's Solitaire, Canyon Wren, Black-billed Magpie, Spotted
Towhee, American Crow, Common Raven, Black-capped Chickadee, Bushtit, and
Violet-green Swallow.
Report submitted by Bird Conservancy of the Rockies (<jeff.birek...>)
Dinosaur Ridge - Bird Conservancy of the Rockies information may be found at:

Site Description:
Dinosaur Ridge is the only regularly staffed hawkwatch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Dinosaur
Ridge may be the best place in the country to see the rare dark morph of
the Broad-winged Hawk (a few are seen each spring). Hawkwatchers who linger
long enough may see resident Golden Eagles, Red-tailed Hawks and Prairie
Falcons, in addition to migrating Swainson's, Cooper's and Sharp-shinned
Hawks, American Kestrels and Turkey Vultures. Peregrine Falcons and
Ferruginous Hawks are uncommon; Northern Goshawk is rare but regular.
Non-raptor species include Rock Wren, and sometimes Bushtit, Western
Bluebird, Sandhill Crane, White-throated Swift, American White Pelican or
Dusky Grouse. Birders are always welcome.
The hawkwatch is generally staffed by volunteers from Bird Conservancy of
the Rockies from about 9 AM to around 3 PM from March 1st to May 7th.

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 small signs from
the south side of lot to hawkwatch 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, head through
the gate, and walk to the clearly-visible, flat area at the crest of the

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