At the time of its discovery in 1903, Brachiosaurus was declared the largest dinosaur ever, but other sauropods are now believed to have been bigger and heavier than Brachiosaurus. ... Unlike most other other sauropods, Brachiosaurus had long forelimbs that caused its back to incline.

Is Brachiosaurus the tallest dinosaur?

The Tallest Dinosaur

This combined with their extremely long necks, which were held vertically, meant they could browse off the tallest trees. Brachiosaurus - the most well known of the group - was 13 metres tall. Sauroposeidon was massive and probably grew to 18.5 metres tall making it the tallest dinosaur.

Was brontosaurus the biggest dinosaur?

The bone clearly belonged to a sauropod—a long-necked dinosaur like Brontosaurus, Diplodocus, and Brachiosaurus. Specifically, it was one of the titanosaurs—the last-surviving group of sauropods, and likely the biggest of them. But even known titanosaurs didn't have thighs that big.