Until now, researchers believed Smilodon populator -- popularly known as the saber-toothed tiger or saber-toothed cat -- looked and acted like a forest-dwelling cat, stalking the ancient jungles of South America. But new research suggests the nearly 900-pound cat hunted South America's open plains.

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Until now, researchers believed Smilodon populator -- popularly known as the saber-toothed tiger or saber-toothed cat -- looked and acted like a forest-dwelling cat, stalking the ancient jungles of South America. But new research suggests the nearly 900-pound cat hunted South America's open plains.