Brachiosaurus is a genus of dinosaur belonging to the family Brachiosauridae, within the group Sauropoda. It lived during the Late Jurassic period, approximately 154 to 153 million years ago, in what is now western North America, particularly regions that are now Colorado, Utah, and Wyoming. The first fossils of Brachiosaurus were discovered in the early 20th century.

Brachiosaurus was a colossal sauropod dinosaur, renowned for its extraordinary height, long neck, and towering presence. It is estimated to have measured up to 85 feet (26 meters) in length, with its elongated neck comprising nearly half of its total body length. Its enormous size made Brachiosaurus one of the largest land animals to have ever existed.

Brachiosaurus was one of the tallest dinosaurs known to mankind. It staggered at least at 52 feet (16m) tall. It would use it´s height to it´s advantage - eating leaves from high tree branches where no other dinosaur could eat. It had unusually long front legs compared to it´s hind legs and a relatively short tail. All of its legs were columnlike in structure - like pillars that could allow to support it´s massive weight. It´s weight was estimated to be upto 40 tons. Its bones were filled with air sacs, reducing overall weight while still maintaining strength. Additionally, its heart, located higher in its body, enabled efficient blood circulation to reach the head and neck at such great heights.

Like other sauropods, its digestion was aided with grinding stones that helped digest the massive amounts of food it was ingesting everyday.