[brak' E O saw' rus] a dinosaur that
lived in the middle to late Jurassic Period,
about 156-145 million years ago
Brachiosaurus was one of the
tallest and largest dinosaurs, standing 40 to 50
feet in height, about 85 feet long, and weighing
between 33 and 88 tons. It had a claw on the
first toe of each front foot and claws on the
first three toes of each rear foot. Each foot had
five toes with flesy pads.
It was assumed for many years
that Brachiosaurus (as well as other giant
sauropods) spent most of their time in water,
letting the water support their weighty bodies.
Now, however, it is believed that they were fully
This herbivore probably ate the
tops of tall trees and swallowed its food whole.
Habits and Behaviors
Brachiosaurus probably traveled
Although none have to date been
found, it is believed that Brachiosaurus hatched
from eggs, like other sauropods.
Brachiosaurus was first found
in the Grand River Valley, in western Colorado
(United States), in 1900. This incomplete
skeleton was first described by paleontologist
Elmer S. Riggs in 1903. It was he who said that
Brachiosaurus' feet and limbs were not broad
enough to support the animal in mud, that its
back was flexible enough to support it on land,
and that its chest was narrow and deep, which is
insufficient for breathing underwater. Other
Brachiosaurus fossils have since been found in
North America and Africa.
genus & species
Brachiosaurus altithorax (the type
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