Ted
Don’t know about night calls, but calls in general are quite different for
the Western Coastal “Yellow-billed” vs Gambell’s. There are call note
differences that are marked in Rufous-collared Sparrow in South America too.
Not sure what to make of some of this, although if I would have split
“Yellow-billed” White-crows as a species years ago if someone was crazy enough
to give me taxonomic control of the universe.
Alvaro
Alvaro Jaramillo
<mailto:alv...@alvarosadventures.com> alv...@alvarosadventures.com
www.alvarosadventures.com
From: bounce-2419656-53236...@mm.list.cornell.edu
[mailto:bounce-2419656-53236...@mm.list.cornell.edu] On Behalf Of Ted Floyd
Sent: Tuesday, November 21, 2017 1:50 PM
To: NFC-L
Subject: [nfc-l] Does "Gambel's" White-crowned Sparrow have a different flight
call?
Hey, all. This is totally conjectural. And it's based on a small sample size.
But, hey, ya gotta start somewhere.
So...a bit more than a month ago, I posted a link to a "Gambel's" White-crowned
Sparrow (subspecies gambelii) flight call I'd uploaded to eBird/Macaulay, and
one person flat-out questioned the ID. That's cool. Always good to maintain a
healthy skepticism. However, the bird in question was perched right in front of
me, in broad daylight.
And now I have another such recording, definitely of a different bird
(different age), and it's not dissimilar from the first. Both have this little
squiggle at the end.
And the only Xeno-Canto upload of gambelii flight calls (other than my own
recordings), by Tayler Brooks, also shows the squiggle.
Again, a pretty small sample. And flight calls are variable. So I'm not wedded
to this. But I thought I'd put it out there.
Here are my two Macaulay uploads:
https://macaulaylibrary.org/asset/75818451
https://macaulaylibrary.org/asset/70518311
And here is the Tayler Brooks recording:
http://www.xeno-canto.org/41863
It might well be nothing at all. But, given that Bill Evans has mentioned that
there's an effort under way to expand the library of flight calls for Flight
Calls of Migratory Birds (hooray!), I guess I've been thinking a bit more about
taxa like gambelii that understandably aren't included in the first/Eastern
edition of Flight Calls.
Ted Floyd
Lafayette, Boulder County, Colorado, USA
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