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Posts Tagged "melanin"

Leucistic Yellow-rumped Warbler

Posted on May 9, 2016

Leucistic Yellow-rumped Warbler

Here is that unique Yellow-rumped Warbler which I mentioned in a previous post. Can you see what looks different about it? I noticed it naked eye while tracking various subjects in a loose flock through the trees last week including more Yellow-rumps, Black-and-white Warblers, Blue-headed Vireos, and Blue-gray Gnatcatchers. After I got my binoculars on it I realized this bird was partially leucistic, and I quickly raised my camera to snap off a record photo. Leucism in birds is when melanin pigments are produced at less than normal levels or in an unexpected pattern. In this case many of the...

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Blue Jay

Posted on Apr 30, 2016

Blue Jay

This Blue Jay (Cyanocitta cristata) was in the shade on a sunny April day, nevertheless showing off blue hues against a blue sky and flying around with its mate. In this case the blues are not as blue as they could be because they are not actually blue. Huh? Their feather barb cells are specially modified scatter light in a way that makes them appear blue instead of what would be brown melanin, and if this bird flew into the sunlight then it would pop even more. Scott Kruitbosch Conservation & Outreach Coordinator

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Melanistic House Sparrow (Passer domesticus)

Posted on Dec 28, 2014

Melanistic House Sparrow (Passer domesticus)

This is one House Sparrow (Passer domesticus) I have never seen before! I took these shots last weekend, the bird being part of a group of well over 100 House Sparrows. The photos are very true to real life appearance and have not been heavily edited. Do you know why it is so dark? It appears to be melanistic which means that the dark-colored pigment melanin in the feathers was produced at higher than normal levels creating an abnormal color. The opposite is known as leucism where pigments are produced at less than normal levels or in an unexpected pattern. Melanism in small songbirds is...

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