Hi Bill,
Being able to separate adult dark-morph Harlan's Hawk *with rufous tails*
from solidly dark Northern (abieticola) Red-tailed Hawk has been a struggle
for me and others with little to no information published on the dark forms
of the latter subspecies. What are the key plumage characteristics that
could help in separating them? Does Harlan's have more barring on the tail,
or more of a bi-colored rufous tail that fades in color towards the base?
What about presence or absence of barring in the outer primaries?
Thanks for any tips that you can provide!
Justin Bosler
Austin, TX
On Mon, Mar 5, 2018 at 7:35 AM, Bill Clark <raptours@xxxxxxxxxxxxx> wrote:
Hi Ken,
I suggest that you read over one or more of my pdfs on my Harlan's Hawk
findings, especially the variation in their adult tails, which do
include many that are partially to mostly rufous. In addition, around
10% of dark-moprh adult Harlan's have a rufous to tawny breast patch.
But they do not have rufous bellies, undertail coverts, and underwing
coverts.
Feel free to contact me after reading them. Go to:
To download pdfâs of one or more of the four draft presentations on my
work on Harlanâs Hawk, go to:
http://www.globalraptors.org/grin/ResearcherResults.asp?lresID5
*And scroll down to âPublicationsâ and click on âpdfâ after one of
these
four:*
Extreme tail variation in adult Harlan's Hawk. (PowerPoint presentation,
January 2014) *pdf*
Harlan's Hawks differ from Red-tailed Hawk. (PowerPoint presentation,
February 2014) *pdf*
Is Harlan's Hawk a subspecies of Red-tailed Hawk? Review of publications
that advocate such -- and why their taxonomic justifications are not
convincing. (PowerPoint presentation, April 2014) *pdf*
Harlan's Hawks are & have been breeding within the Red-tailed Hawk range
in western Canada. (PowerPoint presentation, January 2014) *pdf*
Cheers, Bill Clark
On 3/4/2018 6:49 PM, Ken Hartman wrote:
Christian - I took a look at your photos, and I'm gonna have to disagreeno
with you. All the Harlan's Hawks I've seen (or seen photos of) have white
tails with no red in them, and no rufous on the breast. Really there is
rufous or red on them anywhere. Your bird with the rufous breast and rededition
tail looks like an intermediate Western Red-tailed Hawk. The second
Sibley Guide has great drawings on pages 138-139 that show this. Also aand
photo page on Harlan's at: http://www.schmoker.org/BirdPics/HRLH.html
Ken Hartman
Houston, TX
Hey there,
I had a job in SE Dallas county this morning, and convinced myself to run
down to the same area to try to re-find the Red-tailed Hawk I had seen
photographed yesterday, and hopefully get some better pictures.Parkinson
I was successful in re-finding this bird near the farm houses on
Rd just north of Nokes Rd. I was very lucky to get some digibinned shotsof
it in flight, as well as some digiscoped shots of the bird shaking itsspeckling
plumage showing the upper side of the tail. Over the course of about 45
minutes it remained within a 1/4 mile of this area, soaring and perching,
and interacting with several other Red-tailed Hawks in the area. Both the
other regular HarlanTs Hawks were seen in the area as well.
See the pics I was able to get in this album:
<https://www.flickr.com/photos/131603967@N04/albums/72157693902358945>
https://www.flickr.com/photos/...
I believe that this is a HarlanTs Hawk and not a calurus Red-tailed Hawk.
Specific marks that are characteristic of Harlan's Hawks are the white
streaking on the face (especially near the right eye), some white
on the underparts, and the white base to the body feathers (visible inthe
photo of the bird shaking it's plumage).permission
Also, I was not able to re-find the White-tailed Hawk.
Christian Walker
Independent Adjuster
Irving, Texas
(512) 431-2495
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Bill Clark
Harlingen, Texas
956 364-0415 (Only one now, but a smart one)
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