Brontosaurus by SchleichBrontosaurus by Schleich. Hand painted dinosaur figurine by Scheich. The Brontosaurus has a long tail, an enormous body and a narrow neck. The dinosaur grew to around 15 tons and 22 m. While skeletons of the Brontosaurus have been found, scientists have never found a skull. It probably had a small head similar to the Apatosaurus. The name Brontosaurus means thunder lizard. Scientists used to believe that the dinosaur snapped its tail like a whip.