Of the raven, Audubon wrote, "There, through the clear and rarefied atmosphere, the Raven spreads his glossy wings and tail, and, as he onward sails, rises higher and higher each bold sweep that he makes, as if conscious that the nearer he approaches the sun, the more splendent will become the tints of his plumage." If you look closely at this image, you can see that the various tints are visible in this image. Read Audubon’s full account here.
