Orohippus (Gr., `mountain horse`) is an extinct equid that lived in the Eocene (about 50 million years ago). It is believed to have evolved from equids such as Eohippus, as the earliest evidence for Orohippus appears about 2 million years after the first appearance of Eohippus. The anatomical differences between the two are slight: they were the.....
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http://en.wikipedia.org/wiki/Orohippus
• (n.) A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
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http://thinkexist.com/dictionary/meaning/orohippus/
(from the article `dawn horse`) ...trends are evident. It was a browsing form rather than a grazer and had probably already come to rely heavily upon running in order to escape ... ...and New worlds, the subsequent evolution of the horse took place chiefly in North America. During the remainder of the Eocene, the prime ... [2 related...
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http://www.britannica.com/eb/a-z/o/32
Or`o·hip'pus noun [ New Latin , from Greek
'o`ros , mountain (referring to the Rocky Mountain region) +
'i`ppos horse.]
(Paleon.) A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
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http://www.encyclo.co.uk/webster/O/33
Orohippus Referring to the Rocky Mountain region: A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
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http://www.wordinfo.info/words/index/info/view_unit/1511/2
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