APATOSAURUS

With its pencil-like teeth, this herbivore spent most of its time grazing and swallowing its food whole. Known for having a small head and an even smaller brain, it was still considered to be one of the largest land animals. At ninety feet long and over ten feet tall at the hip, this dinosaur weighed almost forty tons. Its tail alone could reach a length of fifty feet! In terms of age, it would not have been unheard of for an Apatosaurus to celebrate his centennial.