What is Brontotheriidae?
{{Automatic Taxobox | name = Brontotheres | fossil_range = {{Fossil range|56|34}}[[Eocene]] | image = Brontotherium hatcheri.jpg | image_caption = ''Brontotherium hatcheri'' skeleton at the <br />[[National Museum of Natural History]], [[Washington, DC]] | taxon = Brontotheriidae | authority = [[Othniel Charles Marsh|Marsh]], 1873 | synonyms = * '''Menodontidae''' * '''Titanotheriidae''' | subdivision_ranks = Genera | subdivision = }} The '''Brontotheriidae''', also called '''Titanotheriidae''', is a [[Family (biology)|family]] of [[extinct]] [[mammal]]s belonging to the order [[Perissodactyla]]. This is the order that includes [[horse]]s, [[rhinoceros]]es, and [[tapir]]s. On the outside, Brontotheres looked rather like [[rhino]]s, but they were actually more closely related to [[horse]]s. They lived around 56–34 million years ago, until the end of the [[Eocene]]. Later brontotheres were huge, up to 2.5 m (8.2 ft) in height with bizarre horn-like [[skull]] appendages. [[category:Odd-toed ungulates]] {{biology-stub}}