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Paracynarctus is an extinct genus of the Borophaginae and a terrestrial canine ( Bear-dog ) which inhabited most of North America during the Early Hemingfordian stage of the Early Miocene subepoch through the Early Barstovian stage of the Middle Miocene subepoch 20.6 — 13.6 Ma , existing for approximately .
 North America
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 North America