[CT Birds] Mystery Kingbird Revealed

[wingsct at juno.com]

Clay,
I don't think food could be totally ruled out.  For example, the amount of carotene 
(a precursor to vitamin A), or other substance in the diet could be factor.  How
they are metabolized, another factor, or if there's some congenital or genetic blip 
in the bird that affects how nutrients are processed in the body.  
If I rightly recollect, carotene influences the color of Kestrel legs.
Nutrients in the plants that bugs eat can vary widely, depending on what's in the
soil, and other growing conditions, and so on, and so on....

Meredith Sampson
Old Greenwich  


-- "Clay Taylor" <ctaylor at att.net> wrote:
Sarah -

Contact is a maybe (but against what???), food-based is more doubtful - what
insects could impart a yellowish cast to emerging feathers, and what
quantities / duration of feeding would be necessary to cover the entire molt
process?    A baby bird in the nest that is receiving the same kind of bug
from its parents might receive the necessary dosage, but wouldn't that also
make the white along the throat and face turn yellow?

Clay Taylor
Moodus, CT
ctaylor at att.net

----- Original Message ----- 
From: "Peregrine Information Consultants" <info at peregrineinfo.com>
To: "CT Birding Listserv" <ctbirds at lists.ctbirding.org>
Sent: Sunday, January 13, 2008 10:07 PM
Subject: Re: [CT Birds] Mystery Kingbird Revealed


> I wonder if diet or other factors (such as contact with vegetation) might
produce the yellow "wash"?
>
> Sarah
>
> Sarah Hager Johnston, BMus, MLS
> 860-676-2228
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