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Anhui Geological Museum, Hefei. Complete indexed photo collection at WorldHistoryPics.com.

Rahonavis in Royal Ontario Museum.

Caudipteryx zoui, Skelett - Untere Kreide - Liaoning/China - aufgenommen im Museum am Löwentor, Stuttgart

Caudipteryx zoui, Skelett - Untere Kreide - Liaoning/China - aufgenommen im Museum am Löwentor, Stuttgart

The "Big Mama" Citipati osmolskae skeleton (IGM 100/979) on display at the American Museum of Natural History.

Falcarius skeleton reconstruction, Utah Museum of Natural History.

Lourinhanosaurus antunesi in Museum of Lourinhã

Dracovenator on display at the Royal Ontario Museum.

Achelousaurus horneri skull, collected in Glacier County, Montana, at the Museum of the Rockies in Bozeman, Montana. The Ceratopsidae are those dinosaurs with head frills. There are three large subgroups of Ceratopsidae: Centrosaurinae, Ceratopsinae, and Chasmosaurinae. The Triceratopsini are a "tribe" of the Chasmosaurinae -- a genus so vast that it gets the special name "tribe". The Pachyrhinosaurini are a "tribe" within the Centrosaurinae. Achelousaurus is a genus within the Pachyrhinosaurini. So far, only three skulls and some limited skeletal remains have been collected anywhere in the world -- and all of them in Montana. Their bony frills are quite similar to the Styracosaurus albertensis, although their other skull features (such as big bony bosses on the nose and behind the eyes) are not.

Skull cast of Liaoceratops yanzigouensis on display at the Baoding Natural History Museum.

Photo of a skeletal mount of the incomplete holotype of the pachycephalosaur Homalocephale calathocercos in left lateral view, at the Mongolian Natural History Museum. Scan of physical photograph.

Photo of a skeletal mount of the incomplete holotype of the pachycephalosaur Homalocephale calathocercos in left lateral view, at the Mongolian Natural History Museum. Scan of physical photograph.

Photo: mounted skeleton of Qantassaurus intrepidus at the Australian Museum, Sydney.

Holotype skull of Augustynolophus morrisi (LACM 2852) on display at the Natural History Museum of Los Angeles County.

Figure 1, 1a. Outer and oral aspects of the imperfect dentary bone of Sarcolestes Leedsi, from the Oxford Clay of Peterborough. 2/3 nat size. s = symphysis. Figure 1b. A single tooth of the former. 3/1 nat size. Figure 2, 2a. Outer aspect and quadratic cavity of the hinder region of the same jaw. 2/3 nat size. Figure 3. A single tooth of Priodontognathus Phillipsi, 3/1 nat size, shown for purposes of comparison. Specimen in the Woodwardian Museum, Cambridge.

Skeletal mount of Gobisaurus domoculus on display at the Baoding Natural History Museum.