[Tweeters] Brown Crow?

Devorah the Ornithologist birdologist at gmail.com
Tue Aug 9 11:20:12 PDT 2016


well ... it's more difficult to know with mallards, since so many domestic
(white) ducks are hybridising with wild mallards. however, that said, i
assume the genetics of colour are similar to songbirds, at least.


On Tue, Aug 9, 2016 at 5:55 PM, Diane W <diane_weinstein at msn.com> wrote:


> In my area there have been several generations of extremely pale

> mallards. Is this the same type of thing as the brown crow?

>

> This year there was a pale female mallard with two pale ducklings that

> hung out in my yard and out at the pond. Of the two ducklings, now fully

> grown, one is a male and the other is a female.

>

> Diane Weinstein

> Issaquah

> *From:* Devorah the Ornithologist <birdologist at gmail.com>

> *Sent:* Tuesday, August 9, 2016 3:08 AM

> *To:* Terry Sargent Peart <terry.peart at outlook.com>

> *Cc:* Tweeters <tweeters at u.washington.edu>

> *Subject:* Re: [Tweeters] Brown Crow?

>

> hi terry,

>

> it sounds like this crow has a genetic mutation that has knocked out one

> of its melanin producing enzymes, which probably prevents it from producing

> eumelanin. in captive-bred songbirds, this usually is a sex-linked mutation

> known as "fawn" or "isabella". there are two mutations that can be visually

> recognised. one gives the black regions on the bird a red-brown colour

> whilst the other gives the black regions a (paler and less red) beige-brown

> colour.

>

> hope this helps.

>

>

> On Tue, Aug 9, 2016 at 2:47 AM, Terry Sargent Peart <

> terry.peart at outlook.com> wrote:

>

>> I work in Maple Valley at the Cedar Hills Regional Landfill. Yesterday,

>> I saw a Brown Crow... I was stunned. I had my good bins with me and got a

>> good look at it. It was with a few other crows (black) so I was able to

>> compare it with them. It was the same size, same beak, acted the same

>> (they were on the asphalt parking lot picking at probably maggots that fall

>> out of our garbage trailers). The color was even over the whole bird for

>> the most part, even the beak. I would compare the brown with that of a

>> cowbird.

>>

>> I've never heard of a brown crow, so what did I see?

>>

>> Thanks for your help,

>>

>> Terry

>> West Seattle

>>

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>

>

> --

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> Devorah Bennu, PhD

> birdologist at gmail.com

> Blogs: Forbes <http://www.forbes.com/sites/grrlscientist/> | Evolution

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--
GrrlScientist | @GrrlScientist <https://twitter.com/GrrlScientist>
Devorah Bennu, PhD
birdologist at gmail.com
Blogs: Forbes <http://www.forbes.com/sites/grrlscientist/> | Evolution
Institute <https://evolution-institute.org/profile/grrlscientist/?source=> |
Medium <https://medium.com/@GrrlScientist>
Keep up with my writing: TinyLetter <https://tinyletter.com/grrlscientist>
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sunt lacrimae rerum et mentem mortalia tangunt. [Virgil, Aeneid]
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