Small Herbivorous of the group of the ornithopodes and Hypsilophodontidés, the Leaellynasaura is one of rare the Dinosaure S to bear a name of female (another example, the Maiasaura ).

Its principal fossils were discovered on the site of Dinosaur Cove in the south of the Australia and its principal creator allotted the same name to him as his Lea daughter.

A still not-approved theory of the researchers estimates that the Leaellynasaura was one of the dinosaurs which would have hibernated during their passage over Ground. Indeed, there is between 100 and 200 million years, it is practically sure today that the south of Australia was much closer to the South pole and that the climate was relatively hotter than nowadays, insofar as no ice recovered any of the two terrestrial poles. However, it is estimated that the dinosaurs of the site of Dinosaur Cove were to survive the long nights of winter during which very few plants pushed and a hibernation during a few months was then more than essential for these creatures. The scientists think, moreover, that the dinosaurs of Dinosaur Cove hibernated, protected by a cave or a burrow. Lastly, the Leaellynasaura was one of the dinosaurs which had the largest eyes (compared to its head) and this advantage would have enabled him to better penetrate the darkness of the long winter nights of the poles. ----