Brachiosaurus

Brachiosaurus altithorax

A giant dinosaur with very long arms

Numbers

Weight: 124000 lbhistorical estimates for B. altithorax varied over time, from 77,000 to 124,000 pounds; Wikidata reports 128,000 pounds, close to the most recent estimate
Length: 85 ftestimate for Brachiosaurus around 85 feet; Wikidata reports a range between 69 and 98 feet, consistent with this value
Height: 41 ftdeclared range between 40 and 43 feet; here is the intermediate value
Feeding reach: 30 ftwith the neck held in line with the body, not completely vertical; different from the maximum standing height of 40 to 43 feet
Humerus: 80 inupper arm bone of the type specimen, almost as long as the thigh bone
Skull: 32 inestimate by Carpenter and Tidwell; D'Emic and Carrano indicate about 28 inches for the same skull

the genus name means long-armed lizard, because its front legs were significantly longer than its hind legs.
the species name altithorax combines Latin for deep and Greek for chest, referring to the wide chest cavity of the animal.
it was officially described in 1903 by Elmer Riggs, who had already called it the largest known dinosaur back in 1901.
the genus contains only one confirmed species, Brachiosaurus altithorax, since other proposed species in Africa and Europe belong to other groups.
its African relative Giraffatitan was considered the same species for decades, until twenty-six skeletal differences led scientists to separate them.
overall its body shape resembled that of a modern giraffe more closely than any other animal alive on Earth today.
it could raise its head thirty feet off the ground to browse on the highest leaves of tall prehistoric trees.
despite its famous appearance in Jurassic Park, scientific studies show that it was unable to rear up on its hind legs.
the skeleton displayed for years at the Field Museum in Chicago was moved to an airport to make room for Sue.
a young specimen found in Wyoming, measuring about six feet long, is one of the best preserved juvenile sauropod skeletons.

The first one is the question printed in your book: here is the answer. The other four are extra.

Question 1 of 5★ this one is in your book

What does the scientific name of the genus Brachiosaurus mean?

Question 2 of 5

During which geological period did Brachiosaurus live?

Question 3 of 5

Could Brachiosaurus really stand up on its hind legs, as seen in a famous movie?

Question 4 of 5

Which relative of Brachiosaurus is now considered a separate genus?

Question 5 of 5

Where was the first skeleton of Brachiosaurus discovered in 1900?

Experiment 1

With a tape measure and some chalk, draw a line eighty-five feet long in your yard to see the estimated length of an adult Brachiosaurus.

Experiment 2

On a measuring tape, mark eighty inches to see the length of an upper arm bone of an adult Brachiosaurus, then compare it to your arm.

Experiment 3

Imagine a three-story building about thirty feet tall, which is the height that the head of a Brachiosaurus could reach when searching for leaves.