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.
Titanosaur
Titanosaurs (members of the group Titanosauria) were a diverse group of sauropod dinosaurs which included "Saltasaurus" and "Isisaurus". The titanosaurs were the last surviving group of long-necked sauropods, with taxa still thriving at the time of the extinction event at the end of the Cretaceous. The group includes the largest land animals known to have existed, such as "Patagotitan"—estimated at long with a weight of —and the comparably sized "Argentinosaurus" and "Puertasaurus" from the same region. The group's name alludes to the mythological Titans of Ancient Greece, via the type genus (now considered a "nomen dubium)" "Titanosaurus". Together with the brachiosaurids and relatives, titanosaurs make up the larger clade Titanosauriformes.