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Skull cast of Liaoceratops yanzigouensis on display at the Baoding Natural History Museum.

Skeletal cast of Dilong paradoxus on display at the Milwaukee Public Museum. Part of the Tyrannosaurs: Meet the Family traveling exhibit developed by The Australian Museum.

Cast of the skull of Parapsicephalus purdoni (specimen AMNH 1694) in the American Museum of Natural History.

Cast of a Scaphognathus crassirostris, a kind of pterosaur. On display as part of the exhibit "Pterosaurs: Flight in the Age of Dinosaurs" at the Cleveland Natural History Museum in Cleveland, Ohio, in the United States. This animal lived about 150 million years ago. This fossil was found in the Solnhofen formation in Germany. This is a cast; the fossil itself is held by the Institute of Geology and Paleontology at the University of Bonn.

Cast of the known material of Acheroraptor, on display at the Smithsonian's National Museum of Natural History's exhibit The Last American Dinosaurs.

Riojasaurus skull cast, Copenhagen.

"Daspletosaurus torosus" skeleton cast, reconstructed and mounted by Triebold Paleontology based on a nearly complete specimen from Montana's Judith River Formation

A cast of BYU 9025, the holotype fossil of the sauropod dinosaur Supersaurus, a giant scapulocoracoid measuring 2.4m long. • The source photo was taken at the Dinosaur Journey Musuem. • Notes regarding the file; This image was edited and extracted from the original seen here. [1] The Photoshop CC lens correction profile and a 'perspective warp' correction were applied.

Archaeopteryx lithographica, specimen displayed at the Museum für Naturkunde in Berlin. (This image shows the original fossil - not a cast.)

An Ankylosaurus head (cast of specimen AMNH 5214), on display at the Museum of the Rockies in Bozeman, Montana. This is from a specimen collected in Custer County, Montana. The Ankylosauria were armored dinosaurs that lived from 122 million years ago to 66 million years ago in western North America, Europe, and East Asia. There were two subgroups: The Nodosauridae and Ankylosauridae. The Ankylosauridae contained six species, and a single subfamily -- the Ankylosaurinae. There 18 genus within the subfamily, of which Ankylosaurus is the best known. Ankylosaurus as the last of these, and lived 65.5 to 66.5 million years ago. Ankylosaurus was about 20.5 feet long, 5 feet wide, and 5.5 feet tall at the hip. It walked on all fours, with the rear legs longer than the front ones. They ripped vegetation, and swallowed it whole. Their defining feature was their armor. They body was covered in thick, heavy bony plates, and most of the plates were fused together to make them even stronger. Embedded in the skin were more knobs of bone, and the outer skin above these knobs covered in keratin (the same stuff fingernails are made of). Ankylosaurus had a tail club, which consisted of several large osteoderms fused to the last few tail vertebrae. Ankylosaurus was discovered in 1908.

Mounted composite cast of Pteranodon longiceps (=P. ingens) at the American Museum of Natural History, New York. Photo credit Matt Martyniuk henteeth.com

Cast of Datanglong guangxiensis holotype at the National Natural History Museum of China.

Ajancingenia mounted cast (labeled as Ingenia), on display at the Museum of Ancient Life, Utah.

Ajancingenia mounted cast (labeled as Ingenia), detail of pelvis, on display at the Museum of Ancient Life, Utah.

Ajancingenia mounted cast (labeled as Ingenia), detail of skull, on display at the Museum of Ancient Life, Utah.

Shetwemys, Plastral remains of the podocnemidid turtle S. fajumensis (Erymnochelyini). (a–b) NHMUK R3435, anterior plastral lobe, in ventral (a) and dorsal (b) views. (c–d) NHMUK R8441, plaster cast of the specimen CGM C8509, anterior plastral lobe, in ventral (c) and dorsal (d) views. (e–f) AMNH 5093, articulated epiplastra and entoplastron, in ventral (e) and dorsal (f) views. (g–h) SMNS 11233/6, anterior plastral lobe, in ventral (g) and dorsal (h) views. (i–j) NHMUK R3103, partial anterior plastral lobe, in ventral (i) and dorsal (j) views. (k–l) SMNS 11233/5, right hypoplastron, in ventral (k) and dorsal (l) views. (m–n) SMNS 11233/3, articulated left hypoplastron and xiphiplastron, in dorsal (m) and ventral (n) views, and detail of the outer ornamental pattern (o). Gebel Quatrani Formation, Fayum depression, Egypt, Lower Oligocene (Rupelian)