[Tweeters] Fwd: Eurasian Tree Sparrow Origin

Dennis Paulson dennispaulson at comcast.net
Tue Oct 29 12:45:42 PDT 2019


Eurasian Tree Sparrows are common on the Pacific coast of Asia, so getting onto a ship is not at all unlikely, but it would have had to find food for that long journey (one estimate is 19 days from Xiamen, China, to Seattle).

To me, a question that is just as interesting is how, no matter where it came from, a bird like that finds feeders such as those at Butler’s, nestled back in the woodland. Think about it.

Dennis Paulson
Seattle


> On Oct 29, 2019, at 12:01 PM, tweeters-request at mailman11.u.washington.edu wrote:

>

> Date: Tue, 29 Oct 2019 05:09:43 -0700

> From: Matt Bartels <mattxyz at earthlink.net <mailto:mattxyz at earthlink.net>>

> To: tweeters <tweeters at u.washington.edu <mailto:tweeters at u.washington.edu>>

> Subject: [Tweeters] Fwd: Eurasian Tree Sparrow Origin

> Message-ID: <9CD1DF41-6F39-41B2-96B9-F0407F95F32A at earthlink.net <mailto:9CD1DF41-6F39-41B2-96B9-F0407F95F32A at earthlink.net>>

> Content-Type: text/plain; charset="utf-8"

>

> Hi hi -

> I?ll chime in on this one :

> The WBRC follows the ABA in its determination of ?countable? birds ? So, yes, by ABA rules, ?ship assisted? alone doesn?t make a bird uncountable.

> Here?s the section from the ABA listing rules [http://listing.aba.org/aba-recording-rules/ <http://listing.aba.org/aba-recording-rules/> <http://listing.aba.org/aba-recording-rules/ <http://listing.aba.org/aba-recording-rules/>> ]

>

> Rule 3 part a:

> (i) An otherwise wild bird that voluntarily uses or is attracted to a feeder, nest box, audio playback, ship at sea, or other nonnatural device, without being captured, is still considered wild. Physical contact between an observer and a bird does not automatically preclude a bird from being counted, as there are situations where wild birds have learned to eat from outstretched hands or have used people as temporary perches.

>

> However, the question is whether it is more likely that a bird alighted on a ship and stayed there unassisted for a journey ? for example, the Brown Booby that rode into Edmonds on a sailboat was free to go at any time, so it was countable.But when a House Swift was found dead in BC in 2017, it was ultimately judged more likely that it had been trapped in a container for the cross-Pacific journey than that it had freely crossed on its own.

>

> With Eurasian Tree Sparrow, I imagine it will be worth a discussion of whether a bird like that [a] is more likely to have wandered west from its core range in MO or [b] if it came from Asia if it was more likely to have freely sat on a ship for the journey or perhaps been stuck inside a container, like House Sparrows in a big WalMart.

>

> It will be worth a discussion, for sure!

>

> Matt Bartels

> Secretary, WBRC

> Seattle, WA


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