POTD 4/26/21

April 26, 2021  •  1 Comment

SLIGHTLY IRIDESCENT - A Common Grackle struts in the sun.  Grackles look all black until the sun strikes, giving their feathers an iridescent glow. Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. The iridescence of Grackle's feathers comes from the interaction of light waves with the microscopic structure of the feathers so that only certain wavelengths are reflected.


Ruth Dubbs(non-registered)
Magnificent and quite interesting Facts!
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