Acquiring and setting up Gyazo for use couldn't be easier, in fact, it literally can be done in two easy steps. 1  Download the .exe from here. 2  Run the .exe, make sure that you tick Create a Quick Launch icon box, the desktop shortcut option is up to you.
Quick Answer. In a British study using different colored bird feeders, birds were most attracted to silver, blue and green. However, such preferences varied according to species, with goldfinches preferring green. Continue Reading.
All blue coloration in birds and butterflies, for example, is structural in nature. Blue eyes in humans are caused by the same Rayleigh scattering phenomenon @tennesseejac mentioned. So it would seem that only one remote corner of the animal kingdom has evolved an actual blue pigment.