Lesothosaurus was a small dinosaur from South Africa. It was perhaps an omnivore, eating mostly plants, but sometimes eating carrion and insects.
Lesothosaurus has not appeared physically in any films or novels. However, it does appear as a silhouette on the Holoscape screen in the Innovation Center of Jurassic World. Lesothosaurus apparently went extinct on Isla Nublar in 2018.
It also appears in Jurassic Park III: Park Builder as Herbivores Ones.