Brontotheriidae

Brontotheriidae is an extinct family of large herbivorous odd-toed mammals, best known for hornlike bony projections on the skulls of many members. Brontotheres lived mainly during the Eocene.

Perissodactyla: Perissodactyla is the mammalian order of odd-toed ungulates, including horses, rhinoceroses, and tapirs. Brontotheres belong to this order, whose limb and tooth patterns frame their anatomy.
Brontothere skull: A brontothere skull is the robust cranium of a brontothere, often bearing paired hornlike bony projections. Its changing shape and projections distinguish many genera in the family.
Megacerops: Megacerops is a large, late Eocene brontothere genus from North America. Its massive body and forked nasal projections exemplify the family’s best-known form.
Eotitanops borealis: Eotitanops borealis is an early Eocene species of small brontothere from North America. It is among the early forms used to trace the family’s initial diversification.
Eocene–Oligocene extinction event: The Eocene–Oligocene extinction event was a major turnover in life around 34 million years ago. Brontotheres disappeared near this climatic and ecological transition.
Eocene: The Eocene is a geological epoch spanning about 56 to 34 million years ago. Most brontotheres lived during this warm interval of mammalian diversification.
Brontothere dentition: Brontothere dentition comprises the teeth used by these mammals to crop and chew vegetation. Tooth form helps reconstruct diet and identify evolutionary changes within the family.
Brontotherium: Brontotherium is a genus of large Eocene brontotheres named from fossils found in North America. Its name gave the family the familiar term brontothere.
Uintan North American Land Mammal Age: The Uintan is a North American land-mammal age spanning part of the middle Eocene. Brontotheres diversified in North America during this interval.
Climate change: Climate change is a sustained shift in average climate conditions over time. Cooling and drying trends near the Eocene’s end altered habitats associated with brontothere decline.

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