Date: 3/6/18 7:21 am From: Justin Bosler <justin.bosler...> Subject: [texbirds] Re: Dallas County Red-tailed Hawk
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...> 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 pdf’s of one or more of the four draft presentations on my > work on Harlan’s Hawk, go to: > > http://www.globalraptors.org/grin/ResearcherResults.asp?lresID5 > > *And scroll down to ‘Publications’ and click on ‘pdf’ 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 disagree > > 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 > no > > rufous or red on them anywhere. Your bird with the rufous breast and red > > tail looks like an intermediate Western Red-tailed Hawk. The second > edition > > Sibley Guide has great drawings on pages 138-139 that show this. Also a > > 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 > and > > photographed yesterday, and hopefully get some better pictures. > > > > > > > > > > > > I was successful in re-finding this bird near the farm houses on > Parkinson > > Rd just north of Nokes Rd. I was very lucky to get some digibinned shots > of > > it in flight, as well as some digiscoped shots of the bird shaking its > > 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 > speckling > > on the underparts, and the white base to the body feathers (visible in > the > > photo of the bird shaking it's plumage). > > > > > > > > > > > > Also, I was not able to re-find the White-tailed Hawk. > > > > > > > > > > > > Christian Walker > > > > > > Independent Adjuster > > > > > > Irving, Texas > > > > > > (512) 431-2495 > > > > > > > > > > > > > > > > Edit your Freelists account settings for TEXBIRDS at > > http://www.freelists.org/list/texbirds > > > > Reposting of traffic from TEXBIRDS is prohibited without seeking > permission > > from the List Owner > > > > > > > > -- > Bill Clark > Harlingen, Texas > 956 364-0415 (Only one now, but a smart one) > What have you done for raptors today? > > > > > Edit your Freelists account settings for TEXBIRDS at > http://www.freelists.org/list/texbirds > > Reposting of traffic from TEXBIRDS is prohibited without seeking permission > from the List Owner > > >