Brachiosaurus was a huge plant eating dinosaur that lived during the last half of the Jurassic period
Brachiosaurus. It means Arm Lizard because of its long front arms.
About 25m/26m
6 to 7 metres tall at the hip, 13 to 15 m tall to the head
Over 60 tonnes
Fossils have been found in modern North America and Africa.
Plants, mostly leaves from trees.
Late Jurassic between about 175 and 150 million years ago
Mesozoic Era
Triassic Period Jurassic Period Cretaceous Period
Early - Middle Late Early Middle Late Early Middle Late
248 227 206 180 154 144 127 89 65

Brachiosaurus was one of the largest animals that has ever lived on this planet. It was a saurischian (lizard hipped) sauropod type dinosaur that lived over 150 million years ago during the last half of the Jurassic period. It was a quadruped, meaning that it walked on all fours, though on occasions it may have reared up on its hind legs to reach the topmost branches of the trees. Unusually for a dinosaur, its front legs were longer than its hind legs.

Brachiosaurus had a small head with the nostrils at the top rather than at the frontHaving such a large bulky body would have meant it had few predators; Allosaurus would probably have preyed on young and sick animals but an adult would present an almost impossible challenge, even for those skilled killers.

The great size of Brachiosaurus was not without its own challenges; to get blood to the head needed a large powerful heart, as big as a modern small car, that pumped the blood at a very high pressure up the long neck to the brain. This requires big, muscular blood vessels packed with valves to prevent the blood flowing back. An unusual feature of Brachiosaurus was its nostrils; they were placed at the top of its head. The reason for this was originally thought to be because they were aquatic animals living in water to support their great weight, but this theory has since been disproved; a deep narrow body and relatively small foot print are not features suitable for living in water.

Brachiosaurus' are thought to have lived in herds that browsed amongst the tree tops, moving on after they had exhausted the local food supply. To do this they had 52 chisel shaped teeth, 26 in each jaw, at the front of the mouth for stripping the foliage from the branches. They may also have swallowed stones to help grind up the rough vegetation in the stomach.

Brachiosaurus was found in the lands now known as North America and Africa

Brachiosaurus used to live in what is now known as North America and Africa

The life span of these animals is thought to have been up to 100 years; early life would have been hazardous, however, as Brachiosaurus did not look after its young, and infant mortality rates would have been high.