Re: Selasphorus hummingbird in Pleasant Hill
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Of interest to everyone: Sibley says the "general shape and pattern of dives is distinctive", then shows Rufous performing repeated steep dives while Allen's "often" begins with back and forth shuttle display before doing a single steep dive. I've taken this to mean that the display is a reliable field mark to tell males apart.
Of interest to Fred: I go to the garden at Panoramic Hill frequently (using the Claremont Canyon ebird hotspot). The two male Selasphorus hummingbirds you saw up there are Allen's. I've seen them many times in the same general locations for several weeks (first saw one Feb 4, the other Feb 14), have watched them display, and have pictures of the tail feathers of one.
If you're interested in seeing completely orange backed Rufous Hummingbirds in that area, I found a couple two days ago and refound them both yesterday lower in Claremont Canyon. I didn't look for them today so they may have moved on. Both required some patience to get good looks. Coordinates and a photo are in this ebird checklist: https://ebird.org/checklist/S66415159
Happy and safe spring,
On Tue, Mar 31, 2020 at 5:55 PM Fred Werner <sustainablefred@...> wrote: