Photo of the Day: The Knysna Turaco's feathers contain turacoverdin—a unique copper-based pigment that gives them their vivid green coloring. #TheMoreYouKnow . . . #POTD #photooftheday #picoftheday #copper #science #nature #naturephotography #wildlife #wildlifephotography #audobon #aviary #aviaryphotography #southafrica #bird #birdsofinstagram #facts #trivia #funfact