Name: Orohippus ‭(‬Mountain horse‭)‬.
Phonetic: Ore-oh-hip-us.
Named By: Othniel Charles Marsh‭ ‬-‭ ‬1872.
Synonyms: Helohippus,‭ ‬Helotherium,‭ ‬Oligotomus,‭ ‬Orotherium.
Classification: Chordata,‭ ‬Mammalia,‭ ‬Perissodactyla,‭ ‬Equidae,‭ ‬Hyracotheriinae.
Species: O.‭ ‬pumillus‭ (‬type‭)‬,‭ ‬O.‭ ‬agilis,‭ ‬O.‭ ‬major,‭ ‬O.‭ ‬progressus,‭ ‬O.‭ ‬proteros,‭ ‬O.‭ ‬sylvaticus.
Diet: Herbivore.
Size: Around‭ ‬60‭ ‬centimetres high at the shoulder.
Known locations: USA.
Time period: Ypresian to Lutetian of the Eocene.
Fossil representation: Multiple specimens.

       As a primitive Eocene era horse Orohippus‭ ‬ is‭ ‬thought to have primarily been a browser,‭ ‬which means it ate leaves of plants rather than grazing grass.‭ ‬However the teeth are also more suited for grinding rather than slicing which suggests a specialisation in eating tougher kinds of vegetation.‭ ‬Orohippus is thought to be descended from other earlier forms such as Hyracotherium,‭ ‬and Orohippus in turn is regarded as the ancestor of Epihippus.‭ ‬Predators of Orohippus likely included creodonts and early nimravids.

Further reading
- On Ornithopsis, a gigantic animal of the pterodactyle kind from the Wealden. - Annals and Magazine of Natural History, series 4 5:279-283. - H. G. Seeley - 1870.
- Note on some dinosaurian remains in the collection of A. Leeds, Esq. Part I. Ornithopsis leedsii. Part II. Omosaurus, sp. - Geological Magazine, decade 3 4:375-376. - J. W. Hulke - 1887.


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