The scientific genus name for a group of extinct Eocene mammals that were large, rhinoceros-like animals with paired horns.
From Greek 'bronte' (thunder) and 'therion' (beast). The scientific Latin nomenclature for this prehistoric animal group discovered and classified in the 19th century.
Brontotherium fossils are so common in the Badlands of South Dakota that they're basically the signature fossil of that region, like finding a T-Rex tooth would be iconic elsewhere.
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