/tags/robert-clark Robert Clark en-US Copyright Thu, 06 Apr 2017 08:00:00 GMT /science/2017-04-06/the-amazing-functions-and-beauty-of-bird-feathers One-time Cincinnati Post photographer Robert Clark is now an acclaimed freelance photographer who often goes on assignment for National Geographic. Last… Thu, 06 Apr 2017 08:00:00 GMT /science/2017-04-06/the-amazing-functions-and-beauty-of-bird-feathers