These large teeth belonged to a _Brontotherium,_ a large hoofed mammal related to horses and rhinos. roamed that scrubby woodlands of South Dakota and Nebraska in large herds during the Oligocene. They were huge mammals standing over 8 feet tall at the shoulders, larger than any present day rhino.

Species: _Titanotherium ingen_

Age: 30 - 35 Million Years Old

Location: Chadron Formation, Pennington County, South Dakota.

Size: 7.5" x 3.5" x 3.25" / 19 cm x 9 cm x 8.2 cm.

Weight: 1211g / 2 lb 10 oz.