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Skull of Pteranodon sp. (specimen AMNH 7515) in the American Museum of Natural History.

Skull of Pteranodon sp. (specimen AMNH 7515) in the American Museum of Natural History.

Perot Museum Reconstructed skeleton of Convolosaurus in the foreground, with an adult Tenontosaurus behind it. Skeletons are from the Cloverly Formation of Montana.

Perot Museum Reconstructed skeleton of Convolosaurus in the foreground, with an adult Tenontosaurus behind it. Skeletons are from the Cloverly Formation of Montana.

Perot Museum Reconstructed skeleton of Convolosaurus in the foreground, with an adult Tenontosaurus behind it. Skeletons are from the Cloverly Formation of Montana.

Perot Museum Reconstructed skeleton of Convolosaurus in the foreground, with an adult Tenontosaurus behind it. Skeletons are from the Cloverly Formation of Montana.

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

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

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

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

Collection of four troodontids, clockwise from top left: Mei long, unnamed Alaskan troodontid, Jianianhualong tengi, Sinovenator changii.

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.