Date: 10/27/19 2:15 pm
From: Bob Archer <rabican1...>
Subject: [obol] Re: Grants Pass Costa's Hummer is a hybrid
Not sure why hybrid is being mentioned based solely on song, young male
Costa's can indeed give a very Anna's like song. And they molt into adult
plumage from late fall to early winter. So feathers are growing.

Bob Archer

On Sun, Oct 27, 2019 at 12:33 PM <dpvroman...> wrote:

> Was able to view the bird in question yesterday. However, I was not able
> to hear the bird calling with my high frequency hearing loss. The
> hummingbird's hosts, who can hear the bird, indicated that it's call was
> different than Anna's. Yesterday, saw two hummers attempting to visit the
> feeder and one closely chased the other away. Seen in back light
> conditions and not able to ID either. There is likely Anna's in the area
> as well. It can sometime be tough to figure out just what bird doing the
> singing. Will agree that the gorget "ears" looked shorter then other
> Costa's I have seen, why?
> Dennis (north of Grants Pass)
> On 2019-10-27 11:38, Caleb Centanni wrote:
> Hi all,
> Courtney and I watched the hummingbird with basically perfect Costa's
> plumage and callnotes in Grant's Pass this morning, to our dismay, sing a
> perfect Anna's Hummingbird song. Notes (and later tonight recordings) here:
> The bird does have slightly short gorget corners and perhaps a slightly
> long tail, but considering that we and several eBird reviewers called it
> pure Costa's based on plumage, this raises some serious questions about
> whether non-singing Costa's Hummingbirds in Oregon can be identified to
> species. Is there any chance it could be imitating the Anna's song? This
> seems unlikely, since hummingbirds are non-passerines.
> Good birding to all,
> Caleb Centanni

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