CBS News: Illustrator David Sibley's bestselling field guides for birdwatchers cover more than 800 species.
https://www.cbsnews.com/news/for-the-birds-illustrator-david-sibley/?ftag=CNM-00-10aag7e
https://www.cbsnews.com/news/for-the-birds-illustrator-david-sibley/?ftag=CNM-00-10aag7e