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These long, blade-like canines seem almost perfectly optimized to kill prey. They've evolved at least five times in mammals, most notably in the saber-tooth cat Smilodon, who sported serrated ...

These long, blade-like canines seem almost perfectly optimized to kill prey. They've evolved at least five times in mammals, most notably in the saber-tooth cat Smilodon, who sported serrated sabers ...

They've evolved at least five times in mammals ... tale of evolution - getting too good at one thing just might lead to extinction.