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Borophaginae
Extinct subfamily of carnivores / From Wikipedia, the free encyclopedia
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The extinct Borophaginae form one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Hesperocyoninae and extant Caninae.[2] Borophaginae, called "bone-crushing dogs",[3][4] were endemic to North America during the Oligocene to Pliocene and lived roughly 34—2.5 million years ago, existing for about 33.5 million years.