Dinosauria

Moyeni dinosaur tracks. Photographs of plaster casts (positives) of Grallator track 6 (A) and Anomoepus track 8 (B) made at the Moyeni tracksite by the authors. Tracks are shown at the same scale (10 cm), and hatching pattern indicates broken surfaces. The Grallator hind foot print was made by pedal digits II–IV; the trackmaker's phalangeal formula was 3–4–5. Digits I and V did not contact the substrate. The rugose texture surrounding the print is the algal mat. The Anomoepus manus–pes couple registers all five manual digits (i–v), four pedal digits (I–IV), the metatarsus (mt), and toe drag marks (dm). Additional structures to the left of the pes are incidental marks made by a different trackmaker.

Camarasaurus lentus (Marsh, 1889) sauropod dinosaur from the Jurassic of Utah, USA (public display, CM 11338, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA). This is a near-complete juvenile sauropod dinosaur in the original fluvial sandstone matrix - such skeletons are extremely rare. Classification: Animalia, Chordata, Vertebrata, Dinosauria, Sauropodomorpha, Camarasauridae Stratigraphy: Brushy Basin Member, Morrison Formation, Upper Jurassic, 151 Ma Locality: Carnegie Quarry, Dinosaur National Monument, northeastern Utah, USA Sauropod dinosaurs were the largest terrestrial animals ever. They all have the same basic body plan: large body with four walking legs, very long neck & tail, and a small head relative to body size. Sauropods were herbivores, and are often perceived as holding their heads & necks up high to reach vegetation normally out of reach to other organisms. Modern reconstructions of many sauropod species depict them with heads and necks held close to the horizontal, or at low angles above the horizontal.

Camarasaurus lentus (Marsh, 1889) sauropod dinosaur from the Jurassic of Utah, USA (public display, CM 11338, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA). This is a near-complete juvenile sauropod dinosaur in the original fluvial sandstone matrix - such skeletons are extremely rare. Classification: Animalia, Chordata, Vertebrata, Dinosauria, Sauropodomorpha, Camarasauridae Stratigraphy: Brushy Basin Member, Morrison Formation, Upper Jurassic, 151 Ma Locality: Carnegie Quarry, Dinosaur National Monument, northeastern Utah, USA Sauropod dinosaurs were the largest terrestrial animals ever. They all have the same basic body plan: large body with four walking legs, very long neck & tail, and a small head relative to body size. Sauropods were herbivores, and are often perceived as holding their heads & necks up high to reach vegetation normally out of reach to other organisms. Modern reconstructions of many sauropod species depict them with heads and necks held close to the horizontal, or at low angles above the horizontal.

Montage of four pachycephalosaurs. Clockwise from top left: Stegoceras, Prenocephale, Pachycephalosaurus and Homalocephale. These files are already on Commons with their respective licenses. This montage was made for the article Pachycephalosauria on Wikipedia. File:Stegoceras mount.jpg File:Dinosauria - Prenocephale.jpg File:Fossil Pachycephalosaurus.jpg File:Homalocephale skull.jpg

Saltasaurus (which means "lizard from Salta") was a sauropod dinosaur of the Late Cretaceous Period. Relatively small among sauropods, though still massive by human standards, it was characterized by a diplodocid-like head

Saltasaurus (which means "lizard from Salta") was a sauropod dinosaur of the Late Cretaceous Period. Relatively small among sauropods, though still massive by human standards, it was characterized by a diplodocid-like head

Saltasaurus (which means "lizard from Salta") was a sauropod dinosaur of the Late Cretaceous Period. Relatively small among sauropods, though still massive by human standards, it was characterized by a diplodocid-like head

Saltasaurus (which means "lizard from Salta") was a sauropod dinosaur of the Late Cretaceous Period. Relatively small among sauropods, though still massive by human standards, it was characterized by a diplodocid-like head

Elangatoolithidae fossil dinosaur eggs, from China. Exhibit in the Academy of Natural Sciences, 1900 Benjamin Franklin Parkway, Philadelphia, Pennsylvania, USA. Photography was permitted in this area of the museum without restrictions.

Fossil specimen of Ornithomimus sp. (TMP 1995.110.1), Royal Tyrrell Museum. This specimen was recovered from the middle Dinosaur Park Formation of Alberta, Canada.

Dinosaur State Park and Arboretum, Rocky Hill, Connecticut, USA. Close-up of dinosaur prints.

Chasmosaurus belli ROM 843, Royal Tyrrell Museum of Paleontology. Late Cretaceous 75-74.5 millions years ago. Found at Dinosaur Provincial Park, Alberta, and prepared at the Royal Tyrrell Museum of Paleontology, Drumheller, Alberta.

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Taken at the Minnosota Science Museum: Dinosaurs and Fossils Gallery. Creative Commons licensed photo by ideonexus.com. Please feel free to take and reuse for any purpose.

Montage of six dinosaur fossils: (clockwise from top left) Deinonychus antirrhopus, Buitreraptor gonzalezorum, Velociraptor mongoliensis, Microraptor gui, Halszkaraptor escuilliei, and Zhenyuanlong suni. This is a collection of six different works already found in Wikimedia Commons: File:Deinonychus FMNH.jpg File:Buitreraptor FMNH.jpg File:Velociraptor Wyoming Dinosaur Center.jpg File:MicroraptorGui-PaleozoologicalMuseumOfChina-May23-08.jpg File:Halszkaraptor escuilliei.jpg File:Zhenyuanlong.jpg All of them are either under a free license already in Wikimedia Commons or in the public domain