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HUMMINGBIRDS. I believe this but copied from a site about gardening

Birding experts Kenn and Kimberly Kaufman explain. Its true. When we look at an Annas or ruby-throated hummingbird, for example, were not really seeing green pigment on their back feathers or red pigment on their throat feathers. Instead, those are structural colors. The feather itself is just dull and dark, but its covered with transparent layers of particular shapes that operate like a prism. They bend the light and reflect back only certain colors. This is why the colors can seem to change, too. Those red throat feathers may look orange, gold or even green, depending on the angle of the light.