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Nivalis

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Posts posted by Nivalis


  1. 4 hours ago, Charlie Spencer said:

    I'm not sure about Pine on #1.  The entire underside appears to be yellow, including the belly and vent where I'd expect white.

    The tail isn't much help, but Palm Warbler, maybe?

    I was thinking palm was a possibility on bird #1 as well


  2. 5 minutes ago, Tony Leukering said:

    It might just be a very old female that has lost so much female hormone that it's expressing male plumage. The peach colored throat is a feature of adult female Red-wingeds. In birds, unlike in mammals such as ourselves, male is the default sex. That is, male is the homozygous sex, rather than female, which is heterozygous. That means that female hormones override the expression of male plumage characters in female birds. When those hormone levels drop below some threshold, male plumage features can begin being expressed -- that is, not overridden. However, I believe that soft-parts coloration, if they differ between the sexes (such as in Bushtit and most ducks), is not affected, as the soft parts are not replaced.

    Whatever the cause, that bird is COOL!

    thats a great theory Tony, I have headed of that but I totally forgot in till now, agree that the bird is awesome!

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