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.
Antarctosaurus
"Antarctosaurus" was a large quadrupedal herbivore with a long neck and tail. As "Antarctosaurus" is not known from a complete skeleton and tail lengths are highly variable among sauropods, the true size of these animals is hard to extrapolate. The type species may have been over 18 meters long, and a second species may have been one of the largest land animals ever. "Antarctosaurus" may have been as tall as 4.5 meters at the shoulder. It's lower jaw was squared off at the tip suggesting a specialised feeding mechanism.