The Bony Labyrinth of a Sea Duck Small 284×320 Medium 568×640 Large 908×1024 Download Tiff Original 2129×2400 | (614.0 KB) Description "Bony labyrinth at the bottom of the trachea of the male Clangula islandica, seen from behind." Elliot Coues, 1884 Keywords bird anatomy, bird's air chambers, birds, bony labyrinth, Clangula islandica, internal parts of birds, North American birds, ornithology, sea duck, tracheal parts Galleries Bird Anatomy Source: Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)