As I look into this mutation more, I have been told by Hein van Grouw that the Chickadee does not contain yellow-to-red pheomelanin so the brown color remaining is just less of the black eumelanin and relatively (or absolutely?) more brown eumelanin. The chemistry of the melanins is still not entirely clear (certainly not to me) but I'm still searching!
On Friday, February 26, 2021 at 12:59:33 PM UTC-5 Gene Scarpulla wrote:
Just a point of clarification --- I was speaking only about the Carolina Chickadee in the photograph, not Carolina Chickadees in general.
Gene
Bowie, Maryland
On Friday, February 26, 2021 at 11:44:29 AM UTC-5, Walter Ellison wrote:
Hi All,
I find this of interest because the Balck-capped Chickadee(BCCH) definitely does express leucism. I have seen at least four leucistic BCCH in New England and there are publications about the phenomenon. Most of these express the trait in having partially to completely white heads.
All the Best & Good Birding,
Walter Ellison
Chestertown, MD
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