English and Scientific names: |
White-tailed Hawk, Buteo albicaudatus |
Number of individuals: |
One, hatch year bird.
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Locality: |
Cameron Parish
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Specific Locality: |
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Date(s) when observed: |
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Time(s) of day when
observed: |
8:05 AM to 8:23 AM, then briefly
at 10:22 AM. |
Reporting observer and address: |
Paul Conover
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Other observers accompanying reporter who
also identified the bird(s): |
Phillip Wallace, Curt
Sorrells, Dan Purrington, and David Muth and I were birding together but in
separate parties. We all independently saw and identified the bird. |
Other observers accompanying reporter who
independently identified the bird(s): |
The Boslers refound and photographed the bird on 10/29. |
Light
conditions (position of bird in relation to shade and to direction and amount
of light): |
Morning sun, good autumn light. Seen well with sun low and behind me,
and the bird in front of me. |
Optical equipment: |
Zeiss 10x binos, Nikon D50 camera with 55-200 lens. |
Distance to
bird(s): |
At closest, within 50 yards. |
Duration of
observation: |
15 minutes, then about 1 minute.
|
Habitat: |
Overgrown field of hundreds of acres, filled with ragweed and other
tall annuals. There were scattered clumps of dead trees and brush-piles
overgrown with vines scattered sparsely throughout the large field.
|
Behavior of bird: |
I first saw the
bird hovering over a grassy/scrubby field
a few hundred yards away to the northwest. It hovered with wings held
roughly horizontal, perhaps slightly above, about 30 yards over the ground. I
could see it was dark, but I couldn’t see the pattern so I started walking
toward it. It then flew into a grove of dead trees and landed on a high snag
on a dead tree. I thought it might be a White-tailed Hawk or perhaps a light
Harlan’s, but that either would be interesting. I expected it to see me
coming through the field of weeds, so I kept my camera ready for it to fly
and was taking pictures at intervals as I approached. Not too long after I
had started walking, my phone buzzed. It was Phillip telling me they were
watching an interesting hawk. I let him know that I was getting fairly close
to it and had photographed it. At one point a Red-tailed Hawk flew up and the
bird defended its perch but didn’t fly. Another time it flew and returned to
a nearby perch. It allowed me to approach all the way to the grove—perhaps
because it didn’t want to cede its perch to the Redtail--and I began making
my way to it through the dead trees. There were a lot of fallen limbs and now
and then I snapped dead limbs, but I was able to get to within a few trees of
it—perhaps 50 yards but probably a bit closer. The ragweed was so tall in
this area that I was enclosed and I wasn’t able to see anything around me,
only above me. I stopped and waited for it to fly. Eventually it stood taller
and ruffled its feathers and I knew it was about to take off. I got a few
pictures of it taking off. At this point, through the weeds and trees, I
heard David speaking to me from nearby, and I realized that he had also seen
the hawk and made his way to it, also, videotaping the bird. It took me a while
to locate David in the tangle. I was glad that everyone in the party was
alert to it. David and I began
walking a nearby treeline hoping for another look at the bird, but we didn’t
find it. Discussing the ID, we
felt it was probably a White-tailed Hawk but waited until we could
conclusively eliminate Harlan’s before calling it one. Later, when our group
had gotten together again, we compared the photos I had taken with the photos
in the Clark and Wheeler photo guide and found that our bird’s underwing
matched White-tailed perfectly. Not long afterwards we
saw the hawk fly up from grassy field with a rat in its talons, flying toward
the thickly wooded west end of
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Description: |
A large hawk, about Red-tailed-size, with bare yellowish legs.
Long-winged, with wingtips extending beyond tail. Dorsal surface solidly
black, without whitish mottling as in some Red-taileds. Head black, but with
paler patches on sides of head. Eyes dark, bill grayish, without yellow cere.
Chin, throat, and upper breast blackish with a white blaze on
mid-breast. Black of ventral surface
becoming mottled with whitish from belly to legs, and becoming predominantly
whitish with scattered small dark marking from legs to tip of undertail
coverts. Underwings: The outermost (3
or 4) primaries emarginated, with the 2 outermost clear white from base to
notch, and blackish from notch to tip. Remainder of flight feathers grayish
in ground color with whitish bases and with fine, narrow, regularly spaced
dark tranverse lines, some wavy, down length of feather. The overall effect
of underwing was a dusky wing with a longitudinal white stripe down the
center of the wing, bordered fore and aft by longitudinal rows of black
spots. Greater coverts
evenly barred dark and white, with dark bars becoming wider distally. Median
secondary? coverts bright white with wide black chevrons on lower border,
narrowly white-tipped, forming distinct blackish underwing bar. Lesser
coverts whitish dotted evenly with black. Hind border of lesser coverts
bordered by row of black chevrons forming another dark wingbar, then a
slightly paler (brown rather than black) wingbar. Median primary coverts
barred black and white, same pattern as greater coverts. This description
is based on the photos, and some of my perceptions of the feathers and tracts
would probably be clearer if I had access to a similar-age specimen. Tail: Feather grayish with
fine, dusky bands evenly but narrowly spaced.
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Voice: |
Not heard. |
Similar
species: |
Ferruginous and Rough-legged eliminated by bare legs.
Swainson’s, Red-tailed and “Harlan’s” seem to be eliminated by pattern of underwing and tail. The combination of white wing lining with darker lesser coverts and dark flight feathers seems to be unique to juvenile White-tailed Hawk. Tail of this bird doesn’t seem consistent with Harlan’s pattern. |
Photographs
or tape recordings obtained? |
I took digital photos, attached, and Muth took video. Some of the others in the party may have taken images. |
Previous
experience with this species: |
Fair amount of experience with this species, but not this age group. |
Identification aids: |
We used A Photographic Guide to North American Raptors Wheeler and Clark soon after observation to see if Harlan’s could be eliminated and found a photo of WTHA with an underwing closely resembling this bird. |
This description is written from: |
Memory, examination of photos |
Are
you positive of your identification? If not, explain: |
Yes. We were careful not to identify this bird at the time without eliminating Harlan’s and other dark Red-taileds, the only real possibilities for confusion. The photos are conclusive. |
Reporter: |
Paul Conover
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Date and time: |
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