 Braco-saurus. Braco-saurus is a genus of sauropod dinosaur that lived in North America during the late Jurassic, about 154-153 million years ago. It was first described by American paleontologist Homer Attriggs in 1903 from fossils found in the Colorado River Valley in western Colorado, United States. Riggs named the dinosaur Braco-saurus Altothorax, the generic name is Greek for arm lizard in reference to its proportionately long arms, and the specific name means deep chest. Braco-saurus is estimated to have been between 18 and 21 meters 59 and 69 feet long. Weight estimates ranged from 28.3 to 58 metric tons 31.2 and 60 for short tons. It had a disproportionately long neck, small skull, and large overall size, all of which are typical for sauropods. Ativically, Braco-saurus had longer forelimbs than hind limbs, which resulted in a steeply inclined trunk, and a proportionally shorter tail. Braco-saurus is the namesake genus of the family Braco-soridae, which includes a handful of other similar sauropods. Most popular depictions of Braco-saurus are in fact based on giraffeatitan, the genus of Braco-sorehead dinosaur from the Tendiguru Formation of Tanzania. Girafatitan was originally described by German paleontologist Werner Janitsch in 1914 as a species of Braco-saurus, the bronze ape, but moved to its own genus in 2009. Three other species of Braco-saurus have been named based on fossils found in Africa and Europe. Two are no longer considered valid, and a third has become a separate genus, buzatitan. The tight specimen of the Altothorax is still the most complete specimen, and only a few other specimens are thought to belong to the genus, making it one of the rare sauropods of the Morison Formation. It is regarded as a high browser, possibly cropping or nipping vegetation as high as 9 meters 30 feet off the ground. Unlike other sauropods, it was unsuited for rearing on its hind limbs. It has been used as an example of a dinosaur that was most likely ectothermic because of its large size and the corresponding need for sufficient forage, but more recent research suggests it was warm-blooded. Among the most iconic and initially thought to be one of the largest dinosaurs, Braco-saurus has appeared in popular culture, notably in the 1993 film Jurassic Park.