Other
Black Hills Institute of Geological Research, Inc.: Ceratopsian
The Ceratopsian dinosaurs, described here, lived in the Cretaceous Period between 135 and 65 million years ago. This group included the Triceratops and the Torosaurus.
Canadian Museum of Nature
Canadian Museum of Nature: Heterodontasauras Tucki
The Heterodontasauras tucki of the Early Jurassic Period is profiled here.