1. 
   Merychippus
   Merychippus meaning ruminant horse) is an extinct, three-toed horse about the size of a pony with a long, horse-like face. It was about 6.5 feet (2 m) long and was roughly 3 feet (1 m) tall at the shoulder. Its middle toe had a well-developed hoof (earlier horses had only toes and no hoof) and suppo...
   Found op http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
   
   
2. 
   Merychippus
   extinct genus of early horses, found as fossils in deposits from the Middle and Late Miocene Epoch (16.4 to 5.3 million years ago). Merychippus ... [1 related articles]
   Found op http://www.britannica.com/eb/a-z/m/76
   
   
3. 
   Merychippus
   Merychippus is an extinct proto-horse of the family Equidae that was endemic to North America during the Miocene from 20.43—10.3 Ma living for approximately {Mya|20.43-10.3|million years}. It had three toes on each foot and is the first horse known to have grazed. Its name means "ruminant horse",...
   Found op http://en.wikipedia.org/wiki/Merychippus
   
   

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