Apatosaurus (pronounced /əˌpætɵˈsɔrəs/), also known by the popular but scientifically obsolete synonym Brontosaurus, is a genus of sauropod dinosaur that lived from about 154 to 150 million years ago, during the Jurassic Period (Kimmeridgian and early Tithonian ages). It was one of the largest land animals that ever existed, with an average length of 23 m (75 ft) and a mass of at least 23 metric tons (25 short tons). 

Category : Advanced (Complex Origami)