Brachiosaurus is one of the largest dinosaurs ever. This titan of the Jurassic was up to 83 feet long and weighed over 50 tons. This dinosaur has been described as being the giraffe of the dinosaur world. However, at 40 feet tall, Brachiosaurus is over twice the height of a 16 foot tall giraffe. Brachiosaurus has been discovered in Africa and North America.