Date: 12/30/20 9:26 am
From: Chris Johnson <ryanjohnson77...>
Subject: Re: [southbaybirds] Possible Costa's Hummingbird at Santa Teresa CP (iNaturalist sighting)
I also think it is likely an aberrant Anna's.

Costa's would also have:
-a longer, unsplit gorget without multiple flares
-white eyebrow extends behind the eye and gives the face a different look
-larger whitish patch behind the gorget


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Bill Bousman <barlowi...>
Date: 12/30/20 9:00 AM (GMT-08:00)
To: <southbaybirds...>
Subject: Re: [southbaybirds] Possible Costa's Hummingbird at Santa Teresa CP (iNaturalist sighting)


I'm unsure about this bird. The upper half looks good for a male Costa's, but the lower half is typical of Anna's. Notice how the tail projects well beyond the wing tips, whereas in Costa's the wing tips are lined up with the the tail or ever so slightly farther. I would think this is too late in the year for a HY male Anna's not to have replaced all of its gorget (sometimes in their molts, you can see individual feathers like this). There are hybrids, of course, but that is a more difficult ID.

Bill Bousman
Menlo Park

On 12/30/2020 8:13 AM, Brooke Miller via wrote:
On Dec. 27, an iNat observer found and photographed a hummingbird he ID’ed as Costa’s. His photo also seems to indicate that it is, as well. Here’s the observation:

Brooke Miller

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