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.
Brachylophosaurus
Apart from the above, "Brachylophosaurus" was a typical hadrosaur which reached an adult length of at least . In 2010, Gregory S. Paul estimated maximum length at resulting in weight of . Like other hadrosaurs, "Brachylophosaurus" possessed features like cheeks to keep fodder in the mouth and dental batteries consisting of hundreds of stacked teeth. These teeth could be used to chew efficiently, a feature rare among reptiles, but common among some cerapodan ornithischian dinosaurs like "Brachylophosaurus".