Triceratops at the American Museum of Natural History in New York City; dinosaur symbol of Wyoming. Photo by David Bruce/Flickr (Noncommercial Use Permitted with Attribution/No Derivative Works).
Official State Dinosaur of Wyoming
Wyoming designated triceratops as the official state dinosaur in 1994 (Wyoming also has a state fossil, adopted in 1987). All State Dinosaurs & Fossils
One of the largest horned dinosaurs, the iconic Triceratops lived in Wyoming over 65 million years ago during the Cretaceous Period. The fearsome-looking horns and frill were used for defense and display - Triceratops was a vegetarian.