Brachiosaurus
Brachiosaurus 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 Elmer S. Riggs in 1903 from fossils found in the Colorado River valley in western Colorado, United States. Brachiosaurus had longer forelimbs than hindlimbs, which resulted in a steeply inclined trunk, and...