GLOSSARY

• BIPEDAL: Walking on two legs
• CARNIVORE: Meat-eater
• CERATOPIANS: Four legged ornithischian
• CRETACEOUS: The third and last Period in the Mesozoic Era, from 145 to 65 million years ago
• DINOSAURS: Land-dwelling reptiles with upright stance that lived between 230 and 65 million years
• EVOLUTION: Gradual change in the characteristics of animals and plants brought about by natural selection acting on successive generations.
• GASTROLITHS: Stomach stones used for grinding up food.
• HADROSAURS: Duck-billed ornithopod dinosaurs with multiple rows for grinding teeth
• HERBIVORE: Plant-eater
• JURASSIC: The middle Period in the Meozoic Era, from 213 to 145 million years ago.
• MESOZOIC: "Middle life" the major time span (era) 245-65 million years ago,informally known as the "age of the dinosaurs"
• ORNITHISCIANS: Dinosaurs with a hip structure in which the two lower bones on each side parrallel and point backwards;all ornithischians were plant-eaters
• ORNITHOPODS: Primarily bipedal ornithischian dinosaurs that developed specialized teeth to grind up tough vegetation
• PROSAUROPODS: One of the earliest groups of dinosaurs, these long-necked saurischian plant-eaters with large thumb claws were distributed world-wide and died out in the early Jurassic
• QUADRUPEDAL: Walking on all four legs
• SAURISCHIANS: Dinosaurs with a hip structure in which the two lower bones on each side point in opposite directions
• SAUROPODS: Large quadrupedal saurischain plant-eating dinosaurs, with very long necks and tails
• THEROPODS: A group of saurischian dinosaurs that includes all meat-eaters, almost all were bipedal.
• TRACKWAY: A series of footprints left as an animal walks over soft ground.
• TRIASSIC: The first period in the Mesozoic Era, from 248 to 213 million years