Thoughts as I stand in line at the airport…

-;migration behavior is very much part of a species niche

-;resident birds have an advantage over migrants because they don't endure the hazards of migration

-;nesting sites may be the limiting factor causing birds to migrate; food not so much in the breeding season when food can be abundant

-;birds are especially suited to migrate because their physiology favors them

-;Jerry Tangren

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________________________________
From: Tweeters <tweeters-bounces at mailman11.u.washington.edu> on behalf of David B. Williams <wingate at seanet.com>
Sent: Tuesday, September 26, 2023 12:06:01 PM
To: tweeters at u.washington.edu <tweeters at u.washington.edu>
Subject: [Tweeters] mtn/urban birds

Greetings. I have been thinking about the relationship between urban birds and mountains birds. When I am up in the mountains, I often see some of the birds of my Seattle yard, such as juncos, robins, and black-capped chickadees. It's my understanding that "my" yard birds do not migrate up to the mountains. Is this correct?

In contrast, I believe that the varied thrushes I see in my yard do migrate up to the Cascades. Is this correct?

Any insights on the connection between birds seen in the Cascades ones in the urban/Puget lowland landscape would be appreciated.

Sincerely,
David
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David B. Williams
www.geologywriter.com
Free newsletter: https://streetsmartnaturalist.substack.com/
I live and work on the land of the Coast Salish peoples and am trying to honor with gratitude the land and those who have inhabited it since time immemorial. I know that I have much more to learn and hope to continue that journey.