Brontosaurus
"Brontosaurus" was a large, long-necked quadrupedal animal with a long, whip-like tail, and forelimbs that were slightly shorter than its hindlimbs. The largest species, "B. excelsus", weighed up to and measured up to long from head to tail. For comparison, the current largest land animal, the average male African bush elephant is 3.20 m (10.5 ft) tall at the shoulder and has a body mass of 6,000 kg (13,228 lb) or 6.6 short tons.
Largest prehistoric animals
Some of the largest-known phytosaurs include "Redondasaurus" with a length of 6.4 meters and "Smilosuchus" with a size of 6.8 meters.
Many large sauropods are still unnamed and may rival the current record holders.The largest-known thyreophoran was "Ankylosaurus" at in length and in weight. "Stegosaurus" was also long but around tonnes in weight.