Stegosaurus

Stegosaurus was a stegosaurian dinosaur of the Late Jurassic. A representative herbivore known from North America's Morrison Formation, it did not live at the same time as the latest-Cretaceous Tyrannosaurus. Early research sometimes reconstructed the back plates lying flat, but better-preserved fossils later changed interpretations. This discovery history shows the importance of the bones' original positions as well as their shapes. Different species and growth stages within the genus mean that not every specimen's plates have the same form.

Features include a small head, broad torso, hind legs longer than the forelegs, large plates in rows along the back and long spikes at the tail tip. The plates were bony structures in the skin, not bones directly attached to vertebrae, so they could scatter during fossilization. Observing plate arrangement separately from tail spikes reveals a more accurate structure than a general impression of a dinosaur with many spikes. A small skeletal head should not prompt a one-word judgment of intelligence or temperament. Body color and the covering outside the plates are reconstruction information absent from the skeletal exhibit.

Teeth and jaws support an interpretation of a plant-eating animal. Tail spikes are studied in relation to defense, but not every spike movement or combat scene can be reconstructed. Several explanations have been proposed for the broad back plates, including display and temperature-related functions. Conspicuousness alone does not establish any single function as their sole purpose. Specific plant foods and browsing heights also require considering body structure alongside contemporary vegetation evidence.

The environment Stegosaurus inhabited is studied through plants, other animals, waterways and sediment traces in the same strata. Both genuine fossils and replica skeletons educate museum visitors, but checking the label's materials makes photographs easier to read accurately. An important observation is the combination of plates on the back, rather than a club, and long spikes at the tail tip. This page's image shows fossils or scientific reconstruction and is not presented as a photographic record of a living animal. Also consider older reconstructions as products of research in their own time.