Brachiosaurus altithorax

(arm bone)

Photo by Mike Brett-Surman

Catalog number: USNM 21903
Collected in 1955 by D. E. Jones,
Montrose County, Colorado,
Jurassic Period, about 150 million years ago

This upper arm bone (right humerus) of Brachiosaurus altithorax was placed on exhibit in 1958. It is situated in the walkway so visitors can touch it and appreciate its enormous size. Directly behind this bone is an illustration of the full-sized animal, showing the location of the right humerus. In the background, the legs of Diplodocus, the largest fully mounted specimen in the Hall, provide a comparison for the difference in size between these two sauropods.