What was a South American herbivore doing with saber teeth?

Some extinct animals have anatomical oddities that seem destined to be confined to the marginalia of history. Questionable characters, such as the single-fingered dinosaur and the flightless, club-winged bird , ultimately died off despite–if not because of–their idiosyncratic adaptations. [More]

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What was a South American herbivore doing with saber teeth?