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Holotype of Rexarthuria or "Palaeornis" clifti, PV OR 2353. Proximal extremity of left humerus.

Protoceratops andrewsi skeleton at Carnegie Museum of Natural History.

Diversity of Marginocephalians. Psittacosaurus, Pachycephalosaurus, Protoceratops, Triceratops, Stegoceras and Prenoceratops.

Cast of Ceratosaurus from the Cleveland Lloyd Quarry, Utah, on display at the Natural History Museum of Utah, Salt Lake City.

A photograph of Coelophysis bauri taken at the Denver Museum of Nature and Science in 2007.

Acrocanthosaurus, North Carolina Museum of Natural Sciences.

The Chicago specimen of Archaeopteryx (PA 830), a well-preserved fossil highlighting the transitional features between non-avian dinosaurs and birds, housed at the Field Museum of Natural History.

Fossil of Anhanguera, an extinct reptile-- Took the photo at Natural History Museum, London

A cast replica of a skeletal mount of the prehistoric pterosaur Anhanguera blittersdorffi on display at Melbourne Museum in Victoria, Australia.

Anhanguera skeleton, North American Museum of Ancient Life.

A photograph of partial specimen American Museum of Natural History (AMNH) 22555, skull without mandible, of Anhanguera sp. (formerly often assigned to Anhanguera santanae),[1] from the Early Cretaceous Romualdo Formation (former Romualdo Member of the Santana Formation) of NE Brazil in right lateral view.

A photograph of partial specimen American Museum of Natural History (AMNH) 22555, anterior dorsal vertebrae, dorsal ribs and partial shoulder girdle (at least right scapula) of Anhanguera sp. (formerly often assigned to Anhanguera santanae),[1] from the Early Cretaceous Romualdo Formation (former Romualdo Member of the Santana Formation) of NE Brazil in dorsal view.

A photograph of partial specimen American Museum of Natural History (AMNH) 22555, posterior dorsal vertebrae, and the sacrum and pelvis (both iliae, and right ischium and pubis) of Anhanguera sp. (formerly often assigned to Anhanguera santanae),[1] from the Early Cretaceous Romualdo Formation (former Romualdo Member of the Santana Formation) of NE Brazil in dorsal view.

The Tyrannosaurus rex, Dromaeosaurus, Triceratops, and Struthiomimus diorama in the Third Planet exhibit at the Milwaukee Public Museum in Milwaukee, Wisconsin (United States).

The Tyrannosaurus rex, Dromaeosaurus, Triceratops, and Struthiomimus diorama in the Third Planet exhibit at the Milwaukee Public Museum in Milwaukee, Wisconsin (United States).

The Tyrannosaurus rex, Dromaeosaurus, Triceratops, and Struthiomimus diorama in the Third Planet exhibit at the Milwaukee Public Museum in Milwaukee, Wisconsin (United States).