<div dir="ltr">Thanks Dan for the reply. I have looked at several different field guides and many photos and I can see what you mean about the shape of the throat patch. I generally never paid much attention to it except to note the color. I guess if someday the species is split then we will have hybrids rather than intergrades.<div>Ken Trease</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 26, 2022 at 4:11 PM Dan McDougall-Treacy <<a href="mailto:danmcdt@gmail.com">danmcdt@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Ken, one way I distinguish the Audubon and Myrtle forms is by the shape of the throat patch, an approach that is helpful throughout the year. I think of the Myrtle showing the throat patch flaring out and upward toward the auricular area, and the Audubon throat patch more vertically aimed toward the breast or underwing coverts. <br></div><div>Recently I observed a bird with a bright white throat patch (Myrtle-y), and in the shape of the Audubon throat patch. <br></div><div><br></div><div>The National Geographic field guide also shows the Myrtle with a whitish supercilium,though that field mark might not always be visible. <br></div><div>
Your photos show yellow/white in the (Audubon-shaped) throat patch, suggesting an intergrade condition. And one of those birds has a distinct white supercillium<br></div><div>Others may know of different distinguishing field marks. Birds of the World goes into a number of subtleties.<br></div><div><br></div><div>Dan McDougall-Treacy<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 26, 2022 at 3:15 PM Kenneth Trease <<a href="mailto:krtrease@gmail.com" target="_blank">krtrease@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I recently returned from a trip to south-central Oregon. I photographed two different Yellow-rumped Warblers (YRWA) that I thought might be intergrades as they seem to have some characteristics of both Audubon's and Myrtle forms. I would be interested to hear other's opinions-intergrades or just within the normal variation for this species? Here is a link to the photos on Flickr:<div><br></div><div><a href="https://www.flickr.com/photos/cavuken/albums/72177720299278430" target="_blank">https://www.flickr.com/photos/cavuken/albums/72177720299278430</a><br><div><br></div></div></div>
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