Dinosaurs are giant Mesozoic reptiles that have survived the extinction along with pterodactyls.
The dinosaurs living below Wayward Island eventually migrated to the surface, repopulating the island which was renamed Dino Island.
In the series only a few dinosaurs from mixed periods survived. This includes stegosaurs and brachiosaurus from the Jurassic, to triceratops and tyrannosaurs from the cretaceous.