- Species: Brachiosaurus altithorax
- Era: Late Jurassic (154-153 Million years ago)
- Locale: North America
Brachiosaurus is estimated to have been between 18 and 21 meters (59 and 69 ft) long; weight estimates range from 28.3 to 58 metric tons (31.2 and 64 short tons). It had a disproportionately long neck, small skull, and large overall size, all of which are typical for sauropods. However, Brachiosaurus also atypically had longer forelimbs than hindlimbs, which resulted in a steeply inclined trunk, and a proportionally shorter tail.