Image © National Geographic Society
- 3.3 ft (1 m) long
- Protection status:
- Did you know?
- Lesothosaurus gets its name from the African country of Lesotho.
- Size relative to a 6-ft (2-m) man:
Lesothosaurus diagnosticus was one of the most primitive and earliest ornithischians, or "bird-hipped" dinosaurs. Ornithischians were one of the two major groups of dinosaurs and included such familiar species as the armor-plated Stegosaurus and Ankylosaurus and the three-horned Triceratops.
Lesothosaurus was small, agile, and bipedal, bearing seemingly little resemblance to the gigantic, quadrupedal ornithischians that came later. But physical features, such as hip structure and jaws and teeth designed to chew plants, link Lesothosaurus to the later ornithischians.
Lesothosaurus evolved in what is now southern Africa in the early Jurassic period, just over 200 million years ago. It gets its name from the African country of Lesotho, where early fossils were uncovered.
The lifestyle of Lesothosaurus has been compared with that of modern-day gazelles, which browse on low-growing vegetation and nervously scan their surroundings for danger, fleeing when a predator approaches too near.
Lesothosaurus had a small head with very large eyes, short front legs with grasping hands, and an elongated body and tail about three feet (one meter) long. Its jaws were lined with small, serrated teeth for shredding plants and, like most ornithischians, its mouth was tipped with a pointed beak. Long, muscular legs, hollow bones, and clawed feet would have allowed this lightweight dinosaur to outsprint or outmaneuver most of its predators.
Lesothosaurus likely died out by the mid-Jurassic, but later ornithischians thrived for some 150 million years until the extinction of the dinosaurs 65 million years ago.
Other Prehistoric Animals
Follow the blog from the Spitsbergen Expedition as they unearth "sea monsters″ from the Upper Jurassic Period 150 million years ago.
Get a glimpse of what prehistoric sea creatures may have looked like millions of years ago.
Could flying monsters have existed? With cutting-edge 3-D filming technology and CGI, Flying Monsters 3D recreates spectacular pterosaurs and brings these giant flying creatures to life.
A bizarre gallery of Mesozoic monsters prompts John Updike to ask: What has evolution wrought?
Scientists estimate only about 3,000 wild tigers are left in the entire world. Meet the subspecies and see what threats each is facing.