MILLARD H. SHARP / SCIENCE PHOTO LIBRARY MILLARD H. SHARP / SCIENCE PHOTO LIBRARY
Pterosaur (Pterodaustro Guinazui). Pterosaurs are flying reptiles that existed at the same time as the dinosaurs. This one is a pterodactyl classified as Pterodactylus kochi. Fossils appear as rock slowly forms around objects buried in mud. As the rock forms, the shape and anatomy of buried animals and plants can be preserved. Here, the bones of the skeleton are clearly seen, with the head at top, the feet at bottom, and with the wings folded. Pterodactylus fossils are mainly found in Germany, dating to 150 to 148 million years ago, during the late Jurassic Period.
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