I saw the same individual the next day. It's an Orange-crowned Warbler, and was singing heartily, but I have the same question about cause.
On Mon, May 13, 2019, 18:24 radiantcreote <acotter...> wrote:
> I came across this bird the weekend on Mt Davidson before last (May 4) > with a nearly bald head. > https://www.inaturalist.org/observations/25029693 > > Not seen anything like it myself. Wondering what kind of disease might > have caused this? > > >
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