Dinosaurs were the dominant group of animals on Earth for over 150 million years. Long-necked, plant-eating sauropods such as Brontosaurus, Diplodocus and Brachiosaurus are probably among the most famous dinosaurs, in part thanks to their huge size and strange body shape (consisting of a long neck, long tail, round body and columnar limbs). Some of the largest sauropods measured up to 37 metres long.