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Why did Phorusracids go extinct?

Being that Phorusracos (Titanis) was one of the few
South American critters to successfully spread to N.
America following the creation of the Central American
land bridge (while the N. American predators wiped out
much of the S. American fauna as I recall), any ideas
why it went extinct?  Any evidence that man had
anything to do with it or does it vanish before the
earliest evidence of man's arrival? 

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