Borophaginae

The subfamily Borophaginae is an extinct group of canids called `bone-crushing dogs` that were endemic to North America during the Oligocene to Pliocene and lived roughly 36—2.5 million years ago and existing for about {Mya|36-2.5|million years}. ==Origin== The Borophaginae apparently descended from the subfamily Hesperocyoninae. The earliest .....
Found on http://en.wikipedia.org/wiki/Borophaginae
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