Number of the Beast?

Counting is one of those skills that was long thought to be uniquely human, though ravens are now reputed to be able to count to seven. It seems that this avian skill is eclipsed by that of some of the truly anciently civilized, though. It seems that in addition to celestial navigation, certain Saharan ants have mastered a specialized form of counting. NPR's Robert Krulwich has the story, a cartoon video, and a picture of an ant on stilts!

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