Great Black-backed Gull
Images: michaelcobballen, Attribution-NonCommercial-ShareAlike License, http://carolinabirds.org/, CC BY-SA 3.0, Bengt Nyman, Attribution License, Andreas Eichler, CC BY-SA 4.0, Andreas Trepte, CC BY-SA 2.5, acryptozoo, Attribution License, Drbrown1970, Attribution-NonCommercial-ShareAlike License, Dendroica cerulea, Attribution-NonCommercial-ShareAlike License, lgooch, Attribution-NonCommercial-ShareAlike License,
Audio: Terje Kolaas, Attribution-Non-Commercial-No Derivatives License, Lars Edenius, Attribution-Non-Commercial-Share-Alike License, Martin St-Michel, Attribution-Non-Commercial-Share-Alike License, Stein Ø. Nilsen, Attribution-Non-Commercial-Share-Alike License,