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Brachiosaurus Questions and Answers
The brachiosaurids (like Ultrasauros, Sauroposeidon, and Brachiosaurus) are the tallest known dinosaurs.
Brachiosaurus and some of the other large sauropods (the huge long-necked plant-eaters) needed to have large, powerful hearts and very high blood pressure in order to pump blood up the long neck to the head and brain. The head (and brain) of Brachiosaurus was held high (many meters) above its heart. This presents a problem in blood-flow engineering. In order to pump enough oxygenated blood to the head to operate Brachiosaurus' brain (even its tiny sauropod brain) would require a large, powerful heart, tremendously high blood pressure, and wide, muscular blood vessels with many valves (to prevent the back-flow of blood). Brachiosaurus' blood pressure was probably over 400 mm Mercury, three or four times as high as ours.
A: Unlike most dinosaurs, the front legs of Brachiosaurus were longer than the back legs.
A: Brachiosaurus was first found in the Grand River
Valley, in western Colorado, USA, in 1900. For more information on Brachiosaurus, click here.
For this information on Brachiosaurus, click here.
A: Brachiosaurus fossils have been found in western North America and Tanzania, Africa.
A: No, the tallest animals are not necessarily the heaviest. For a modern-day example, compare the giraffe and the elephant. The giraffe is much taller, but the elephant weighs much more. Looking at dinosaurs, the giraffe-like Brachiosaurus, Sauroposeidon and Ultrasauros were the tallest dinosaurs, but other sauropods (like Argentinosaurus) weighed more.
There were many different types of plant-eating dinosaurs during the Jurassic and they ate different plants. For example, Brachiosaurus probably ate leaves from high in the trees, but Stegosaurus probably ate low-lying plants.
A: Brachiosaurus lived from 156 million to 145 million years during the Jurassic period (the middle part of the Mesozoic Era).
A: Brachiosaurus averaged about 40-50 feet (12-16 m) tall.
A: Brachiosaurus' neck was up to about 30 feet (10 m) long.
A: Ultrasauros is a dubious genus; it is thought that its fossils are probably bits of a huge Brachiosaurus (the enormous shoulder bone) and a Supersaurus (the vertebrae).
A: Brachiosaurus went extinct roughly 156-145 million years ago. For more information on Brachiosaurus, click here.
A: No one knows with any certainty, but the enormous sauropods (like Argentinosaurus and Brachiosaurus) probably ate huge amounts of food each day.
A: No fossils of Brachiosaurus' internal organs have been found, so it is unknown. It may have had a crop-like organ that contained gastroliths (stones it swallowed to help grind up its tough food). For other information on Brachiosaurus, click here.
A: Yes, some were still around then, including Brachiosaurus (which lived until the early Cretaceous), Algoasaurus, Malawisaurus, Asiatosaurus, Ultrasaurus, Aegyptosaurus, Rebbachisaurus, Hisanohamasaurus, Microdontosaurus, Mongolosaurus, Segnosaurus, Aragosaurus, Macrurosaurus, Pleurocoelus, Neuquensaurus, Chiayusaurus, Megacervixosaurus , and others.
A: Brachiosaurus was a sauropod, a long-necked, long-tailed plant-eating dinosaur (and a saurischian - a lizard-hipped dinosaur).
A: Long-neck is the nickname for a long-necked sauropod dinosaur (which really did exist).
(and Other Prehistoric Creatures)
For brief dinosaur fact sheets, click here.
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