Ceratopsidae (sometimes spelled Ceratopidae) is a speciose group of marginocephalian dinosaurs including Triceratops and Styracosaurus. All known species were quadrupedal herbivores from the Upper Cretaceous, mainly of Western North America (though Sinoceratops is known from Asia) and are characterized by beaks, rows of shearing teeth in the back ... Found on http://en.wikipedia.org/wiki/Ceratopsidae