This is Brachiosaurus, a 13-meter high sauropod that specializes in grazing on the treetops.
— Allen, describing Brachiosaurus
in Time of the Titans

Brachiosaurus (brack-ee-oh-saw-us; "Arm Lizard") is a genus of giant, very large herbivorous sauropod brachiosaurid dinosaur that lived during the Late Jurassic period in what is now North America with close relatives in the same family in Africa and Europe.

Named for the large bones of its foreleg, Brachiosaurus was an enormous sauropod, one of the largest dinosaurs known from a complete skeleton. Brachiosaurus was an over 10-13 meter tall, 25 meters long, 70-80 ton gargantuan reptile, that fed on the tops of Conifer trees in the Late Jurassic forests, sometimes felling them with their sheer bulk if they were taller than them or not.



Brachiosaurus lived during the Late Jurassic Period and the Early Cretaceous Period from 153-135 million years ago. It lived alongside other sauropods and other herbivores as well as predators like Allosaurus.



A Fully-Grown Adult Brachiosaurus

A 13-meter-tall sauropod dinosaur that specialized in grazing on the treetops, adult Brachiosaurus weighed over 70 tons, making them the largest land animals that have ever existed in North America and one of the largest animals that ever walked the planet. Standing 10-13 meters (33-42 feet) tall (as tall as a three story building), measuring 25 meters (75 feet) long (the length of two buses), and weighing over 40-70 tons (more than 10 elephants, give or take adult elephants), thanks to an exclusive, monopolizing on the tops which 'no other Dinosaurs can reach', Brachiosaurus was a gargantuan reptile that were the largest land animals of their time.

Brachiosaurus is the archetypal giant Dinosaur of the Jurassic alongside the giant Diplodocidae genus Diplodocus. Brachiosaurus is controversially referred to as 'the largest land animals that have ever existed'. Contextually one must be careful not to mistake this for having to mean that no other Dinosaur was or could be bigger than Brachiosaurus - or that Brachiosaurus was the largest'. From a sensible point of view, one should see that all that is meant by this admittedly dramatic statement, is that up to now it is the biggest, thus meaning so far life on Earth has never seen an animal of the sheer size of Brachiosaurus (in at least). As many now know, Brachiosaurus, thought once the largest Dinosaur ever known for decades, has some many years ago now been relegated - far surpassed by gigantic sauropod dinosaurs like Argentinosaurus.

Nevertheless, Brachiosaurus is a mighty, majestic and awe-inspiring Dinosaur, as famous now as it has been for decades. Its name means, Arm Lizard, in reference to its and its whole families peculiar trait of having longer forelimbs - or 'arms' - than hindlimbs.

Named for the large bones of its forelegs, this dinosaur was an enormous sauropod. Brachiosaurus held its neck in a vertical position and was adapted to live on land, with similarities to a Giraffe, browsing in treetops. Its peg-like teeth were used to strip leaves from the high branches. Unlike many of its sauropod relatives, Brachiosaurus had very long forelegs, indicating that its neck was held in a more vertical position.


Like all sauropods and other herbivorous dinosaurs, Brachiosaurus traveled in herds. When it came to juveniles, even adolescents, being separated from the herd and being threatened by predators, the best thing about living in a herd was that there was always an adult nearby to help. Their kind could effortlessly harvest cones and fresh leaves no other dinosaur could reach. And they had grown enormous on it. These giants were feeding almost constantly to sustain it enormous bulk.

They fed on the tops of Conifer trees in the Late Jurassic forests, sometimes felling them with their sheer bulk if they were taller than them or not. They fed on tall kinds of trees due to the teeth they had (chisel like) were not much sought after by anything else around; tough Conifer leaves and cones. Diplodocus for instance could only strip the soft ferns and cycads with their weak and simple peg like teeth.