Steve,

Right. The main gist of the post is about non-migratory resident species
that are expanding their ranges northward from Califronia. I tacked
Townsend's Warbler on to illustrate that some short-distance migrants that
summer in the PNW are now staying in the PNW in winter in larger numbers.
This is described in the text. So I agree with your point.

The Sacramento Valley in northern California has seen an increase in
over-wintering migrants-- Western Tanager, House Wren, some warblers. I've
got a paper on that here:

http://www.cvbirds.org/wp-content/uploads/2020/02/Avian-Responses-to-Rapid-Climate-Change.pdf

Avian Responses to Rapid Climate Change: Examples from the Putah Creek
Christmas Bird Count

I suspect the same is happening up here with respect to Townsend's Warbler
(and probably Western Tanager as well).


On Wed, Dec 15, 2021 at 4:50 PM Steve Loitz <steveloitz at gmail.com> wrote:


> Hmmmmm. Many -- I would think most if not nearly all -- Townsend's

> Warblers seen in lowland WA in winter are vertical migrants which spend

> their summers in the WA or BC Cascades or Olympics, and thus are not

> "California birds." Am I missing something?

> --

> Steve Loitz

> Ellensburg, WA

> steveloitz at gmail.com

>



--
​Steve Hampton​
Port Townsend, WA (qatáy)
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