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A Cassin’s vireo at this time of year in SF would almost certainly be an overwintering bird.
While we have a couple of winter records over the years, this seems to me a very normal occurrence of one inexperienced observers making an erroneous report that then convinces other inexperienced observers that’s it’s not time to start reporting the species.
This happens every year and is part of the learning process. No harm done.
On Mar 1, 2021, at 19:20, John Facchini <john.facchini@...> wrote:
I followed up on Ken's post and saw a vireo that was mostly gray and had clear (but not very bold) white spectacles - the bill eliminated kinglets and warblers. I only saw one and didn't hear any vocalizations. I was focused on making sure I got a clear look at the spectacles and didn't get much of a view of the underside of the bird. I was comfortable with a cassin's vireo ID. Your post makes this seem like either an exceptional sighting or a mistaken ID. I don't mean to ruffle any feathers and am ok removing my sighting from ebird if you would like me to.
With all due respect to those posting: Regarding these reports of multiple Cassin’s Vireos from multiple locations , please note that over many decades now a typical arrival
Date for Cassins Vireo in SF is around the first days of April. A few exceptionally early birds have been noted by the third week of March.
Cassin’s vireos winter in Mexico. There’s typically a pulse of migrants noted in SoCal before we start seeing them up here.
Hi all, 2 Cassin's vireos (1 seen, 2 heard) on Oak Woodlands on the wooden box steps leading to Stanyan and Fulton.