schemochromes
grrlscientist | May 11, 2009tags: Blue House Sparrow, Passer domesticus, birds, blue feather color, plumage color, refraction
Blue-colored Male House Sparrow, Passer domesticus,
photographed in Sydney, Australia, April 2009.
Image: Richard Shears, Daily Mail [larger view].
Some of you might remember the remarkable photographs of the blue-colored male house sparrow, Passer domesticus, that was photographed in a garden in Sydney, Australia a couple weeks ago. I posted the images I had, along with my speculations, but was unable to go further than that. However, I tracked down the photographer and he has very kindly…
grrlscientist | April 26, 2009tags: Blue House Sparrow, Passer domesticus, birds, blue feather color, plumage color, refraction
Blue House Sparrow, Passer domesticus, photographed in Sydney, Australia.
I contemplated giving this bird to you as the daily Mystery Bird, but decided that you'd all probably riot, so instead, I am going to identify this bird so we can discuss it. It's a House Sparrow, Passer domesticus. (I have received dozens of emails telling me I'm a dumbshit: this is clearly a Eurasian Tree Sparrow, Passer montanus, thus, my wavering ID).
House Sparrows were introduced in various places around the world…
grrlscientist | October 16, 2007tags: researchblogging.org, blue feathers, Tyndall scattering, Rayleigh light scattering, schemochromes, white feathers
A pair of hyacinthine macaws, Anodorhynchus hyacinthinus.
Image: The Guardian.
Most avian plumage colors are the result of different types of pigments that are deposited into feathers while they are regrowing after moult. However, pigments alone do not produce all avian feather colors. Blues, such as those seen in hyacinthine macaws, Anodorhynchus hyacinthinus, and white, such as the snowy color of Bali mynahs, Leucopsar rothschildi, typically result from small changes in…