Hesperornis Vertebrae Small 320×261 Medium 640×522 Large 1024×835 Download Tiff Original 2400×1958 | (1.0 MB) Description A vertebrae of the Hesperornis regalis, an ancient bird of the Cretaceous Period. Keywords ancient bird, Cretaceous fossils, dinosaur bones, Hesperornis regalis, Hesperornis vertebrae, Mesozoic fossils Galleries Bird Anatomy Source: Dana, James D. New Text-Book of Geology (New York: Ivison, Blakeman & Company, 1883) 320
