This easy to build wood skeleton will delight kids from ages 6 and above taking 30-minutes to build! Paint and spatter with glitter for effect! Did you know? Stegosaurus means 'Roof Lizard'! Stegosaurus have been found in North America and Europe. Stegosaurus lived in the Late Jurassic period, was 10m long and weighed 5 tons. Despite its size, the Stegosaurus' brain was only the size of a dog's. There is debate as to whether Stegosaurus could rear up on its hind legs to browse, whether the plates were for defense or temperature control, and whether the tall spikes were for display or a weapon. 2 x 23cm timber sheets. 30cm long.