"Ceratopsia (Greek: \"horned faces\") is a group of herbivorous, beaked dinosaurs which thrived in what are now North America and Asia, during the Cretaceous Period, although ancestral forms lived earlier, in the Jurassic. Early members such as Psittacosaurus were small and bipedal. Later members, including ceratopsids like Centrosaurus and Triceratops, became very large quadrupeds and developed elaborate facial horns and a neck frill. While the frill might have served to protect the vulnerable neck from predators, it may also have been used for display, thermoregulation, or some combination of the above. Ceratopsians ranged in size from 1 meter (3 feet) and 23 kilograms (50 pounds) to over 9 m (30 ft) and 5,400 kg (6 short tons). Triceratops is by far the best-known ceratopsian to the general public. It is traditional for ceratopsian genus names to end in \"-ceratops\", although this is not always the case. One of the first named genera was Ceratops itself, which lent its name to the group, although it is considered a nomen dubium today as it has no distinguishing characteristics that are not also found in other ceratopsians."@en . "Animalia"@en . "Sauropsida"@en . . . . "Ceratopsia (Greek: \"horned faces\") is a group of herbivorous, beaked dinosaurs which thrived in what are now North America and Asia, during the Cretaceous Period, although ancestral forms lived earlier, in the Jurassic. Early members such as Psittacosaurus were small and bipedal. Later members, including ceratopsids like Centrosaurus and Triceratops, became very large quadrupeds and developed elaborate facial horns and a neck frill. While the frill might have served to protect the vulnerable neck from predators, it may also have been used for display, thermoregulation, or some combination of the above. Ceratopsians ranged in size from 1 meter (3 feet) and 23 kilograms (50 pounds) to over 9 m (30 ft) and 5,400 kg (6 short tons)."@en . "Triceratops skull"@en . "Ceratopsia"@en . . "Ceratopsia (Marsh, 1890)"@en . . "Ceratopsians"@en . . . "Ceratopsia"@en . . . "Ceratopsia or Ceratopia (\"horned faces\") is a group of herbivorous, beaked dinosaurs which thrived in what are now North America and Asia, during the Cretaceous Period, although ancestral forms lived earlier, in the Jurassic. Early members such as Psittacosaurus were small and bipedal. Later members, including ceratopsids like Centrosaurus and Triceratops, became very large quadrupeds and developed elaborate facial horns and a neck frill. While the frill might have served to protect the vulnerable neck from predators, it may also have been used for display, thermoregulation, the attachment of large neck and chewing muscles or some combination of the above. Ceratopsians ranged in size from 1 meter (3 ft) and 23 kilograms (50 lb) to over 9 meters (30 ft) and 5,400 kg (12,000 lb). Triceratops is by far the best-known ceratopsian to the general public. It is traditional for ceratopsian genus names to end in \"-ceratops\", although this is not always the case. One of the first named genera was Ceratops itself, which lent its name to the group, although it is considered a nomen dubium today as it has no distinguishing characteristics that are not also found in other ceratopsians."@en . . . . . . . . . "* Archaeoceratopsidae\n* Ceratopsidae\n* Chaoyangsauridae\n* Leptoceratopsidae\n* Protoceratopsidae\n* Psittacosauridae"@en . . "230"^^ . "pink"@en . . . . . "* Archaeoceratopsidae\n* Ceratopsidae\n* Leptoceratopsidae\n* Protoceratopsidae\n* Psittacosauridae"@en . . . . "Marsh, 1890"@en . "Ceratopsia or Ceratopia (\"horned faces\") is a group of herbivorous, beaked dinosaurs which thrived in what are now North America and Asia, during the Cretaceous Period, although ancestral forms lived earlier, in the Jurassic. Early members such as Psittacosaurus were small and bipedal. Later members, including ceratopsids like Centrosaurus and Triceratops, became very large quadrupeds and developed elaborate facial horns and a neck frill. While the frill might have served to protect the vulnerable neck from predators, it may also have been used for display, thermoregulation, the attachment of large neck and chewing muscles or some combination of the above. Ceratopsians ranged in size from 1 meter (3 ft) and 23 kilograms (50 lb) to over 9 meters (30 ft) and 5,400 kg (12,000 lb)."@en . . . . "Ceratopsia"@en . "fossil"@en . . . . . . "200"^^ . "Triceratops skeleton at the Smithsonian Museum of Natural History."@en .