Hypsilophodon was a small, fast ornithischian dinosaur that lived during the Early Cretaceous Period, about 125 million years ago. It is best known from fossils found on the Isle of Wight in southern England. Its light body, long legs, and balanced tail suggest an animal built for quick running through low vegetation.
Studying Hypsilophodon helps paleontologists understand how small plant eating dinosaurs survived alongside larger predators and herbivores.
Key Facts
- Time period: Early Cretaceous, about 125 million years ago.
- Estimated length: about 1.5 to 2.0 m from snout to tail.
- Estimated mass: about 15 to 25 kg, similar to a medium sized dog.
- Speed relationship: speed = distance / time.
- Classification: Hypsilophodon was an ornithischian dinosaur, not a theropod.
- Diet: mainly plants, with teeth suited for cropping and grinding tough vegetation.
Vocabulary
- Hypsilophodon
- Hypsilophodon was a small, agile ornithischian dinosaur from the Early Cretaceous of Europe.
- Ornithischian
- An ornithischian is a member of a major dinosaur group with a bird like hip structure, although birds evolved from theropod dinosaurs.
- Paleontology
- Paleontology is the scientific study of ancient life using fossils and other evidence preserved in rocks.
- Fossil
- A fossil is preserved evidence of past life, such as a bone, tooth, footprint, or plant impression.
- Cretaceous Period
- The Cretaceous Period was the last period of the Mesozoic Era, lasting from about 145 to 66 million years ago.
Common Mistakes to Avoid
- Calling Hypsilophodon a tiny raptor is wrong because it was an ornithischian plant eater, not a meat eating theropod.
- Saying Hypsilophodon lived with humans is wrong because it lived about 125 million years before modern humans appeared.
- Drawing Hypsilophodon as a tree climbing dinosaur is misleading because modern evidence does not support the old idea that it lived in trees.
- Assuming every small dinosaur was a baby is wrong because Hypsilophodon adults were naturally small compared with many other dinosaurs.
Practice Questions
- 1 A Hypsilophodon model is 20 cm long and represents an animal 1.8 m long. What is the scale ratio of the model to the real dinosaur?
- 2 If a Hypsilophodon ran 60 m in 5 s, what was its average speed in m/s?
- 3 Explain why long legs, a light body, and a stiff balancing tail would help Hypsilophodon escape predators in a Cretaceous environment.