Smilodon was a fearsome Ice Age cat, the size of a modern-day tiger, that had a pair of fangs nearly 18 centimeters long. But it was only the last and largest of the great sabertooths: ridiculously long canines had already been a trend for millions of years by the time Smilodon was prowling around. And you know what? Those giant teeth just might make a comeback.
Correction: At 4:22, we incorrectly use an image of a sand tiger shark in reference to a great white shark. We regret the error.
Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
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Just what is a Nimravid, anyway?