Hey tweets, all this makes me wonder whether we are witnessing the creation and now destruction of a new species. Perhaps NW Crows have been on a path to differentiate themselves from American Crows because of the separation of their populations due to geography, topography, and ecology. But with the arrival of European-style habitation, the two crow populations were linked back together again, re-mixing the gene pool so that an identifiable, separate population of NW Crows (smaller, different voice, etc.) disappeared as a population.
Perhaps the same thing is happening to Hermit Warblers, as their genes mix with Townsend's.
And perhaps a different outcome will result from the migratory separation of Swainson's Thrushes, where the population that winters to the east does not reproductively mix with the population that winters to the west. The summer ranges of these populations come together only in a very narrow band in BC, where it does not appear that easterners and westerners interbreed.
We see only a short snapshot in time. Longer events that move in geologic slow-motion can only be seen by us through the lens of the past. The future is hidden from us and unknown. - Connie, Seattle
csidles at constancypress.com
constancesidles at gmail.com
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On Jun 30, 2020, at 5:22 PM, Dennis Paulson <dennispaulson at comcast.net> wrote:
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Northwestern Crows are thought to have evolved in coastal areas with Native American villages, thus adapted to living around people. Why the eastern crows didn't do the same, I don't know, except that crows have been agricultural pests in the East for a very long time and were often sighted at the end of a gun barrel. That may be why they aren't so tame.
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Dennis Paulson
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Seattle
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On Jun 30, 2020, at 5:03 PM, Catherine Joy <catherinejoymusic at gmail.com <mailto:catherinejoymusic at gmail.com>> wrote:
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Behaviorally, I have noticed the crows on the West coast are more "tame" than East coast birds. I would never see crows just walking around with the pedestrians on busy city streets out East. And I never was able to approach crows so closely until moving here.
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On Tue, Jun 30, 2020 at 4:26 PM Hans-Joachim Feddern <thefedderns at gmail.com <mailto:thefedderns at gmail.com>> wrote:
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This has been a long time in coming and is based on scientific data. Personally I feel there is a difference in vocalization with American Crows and the size difference can be quite obvious. Also habitat: "Northwestern" Crows are rarely found too far from shore. To me there also is a difference between calls of American Crows here in the Northwest and birds on the East Coast. I have never heard a crow in Maryland doing the "meow" call you can hear here frequently. Another interesting observation, is that I have never seen a roadkill-ed crow on the East Coast, but see many around here! Just thinking!
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On Tue, Jun 30, 2020 at 12:55 PM dick <dick at dkporter.net <mailto:dick at dkporter.net>> wrote:
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The 2020 AOS Supplement is out! - American Birding Association
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https://www.aba.org/2020-aos-supplement/ <https://www.aba.org/2020-aos-supplement/>
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Sent from my Verizon, Samsung Galaxy smartphone
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--
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Hans Feddern
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Twin Lakes/Federal Way, WA
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thefedderns at gmail.com <mailto:thefedderns at gmail.com>
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