Triceratops horridus

A scale model of the Triceratops horridus dinosaur that existed in the Late Cretaceous Period (68-65 mya).  It is on display at the Smithsonian National Museum of Natural History in Washington, D.C.

Psittacosaurus & Protoceratops & Bagaceratops

Picture of three casts of dinosaurs.  The fossil casting on the left is a Protoceratops andrewsi of the Late Cretaceous Period (85-80 mya) found in Mongolia.  The cast in the middle is a Psittacosaurus sp. of the Early Cretaceous Period (115-100 mya) also found in Mongolia.  The small skull cast on the right is a Bagaceratops rozhdestvenskyi of the Late Cretaceous Period (85-75 mya) again from Mongolia.

This display was photographed at the Smithsonian National Museum of Natural History in Washington D.C. (August 2010). The description on the sign reads "Psittacosaurus was a small-beaked animal that walked on two legs. Some of the later protoceratopsians walked on all four legs."

Pachychormus bollensis Fish

A Pachychormus bollensis fish fossil from the early Jurassic Period (195 million years ago) of Germany.  Displayed at the Smithsonian Museum of Natural History in August 2010.