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...e tough, low-growing plants of the Late Cretaceous ... 17 Triceratops Facts for Kids and Dinosaur Enthusiasts ... . Triceratops horridus cut a formidable figure in the prehistoric landscape due to its enormous head that was ornamented with three horns and a bony frill studded with spikes. A Triceratops meets up with two hungry T. rex dinosaurs during a meteor shower. Joe Tucciarone / Science Photo Library / Getty Images. As dinosaur fans know, Triceratops and Tyrannosaurus rex occupied the same ecosystem—the marshes and forests of western North America—about 65 million years ago, just before the K-T extinction that wiped out the dinosaurs. Triceratops, with its three horns and bony frill ... Triceratops horridus, facts and photos - National Geographic ... . Triceratops, with its three horns and bony frill around the back of its head, is one of the most recognizable dinosaurs.Its name is a combination of the Greek syllables tri-, meaning "three ... The Triceratops frill might have helped to protect its neck, but some specimens show Tyrannosaurus bite marks puncturing the frill, so it wasn't always enough. The frills could also have been used to attract mates, as a way for members of the same species to recognise each other. Triceratops fossils have been found in the Denver, Evanston, Hell Creek, Lance, Laramie and Scollard geological formations. The holotype specimen for the Triceratops is YPM 1820. The Triceratops is the state dinosaur of Wyoming. The Triceratops is the state fossil of South Dakota. Tyrannosaurs were notoriously vicious hunters that ruled the Cretaceous with their ferocious jaws and cunning pack hunting behavior. See what was up their ti... Triceratops was the last and largest of the horned dinosaurs. It may have been one of the most common dinosaurs in the North American West at the time of Tyrannosaurus rex. These dinosaurs are often pictured traveling in large groups, but the biggest gathering of Triceratops ever found consisted of three youngsters. Perhaps it lived only in family groups....