There's plenty of warfare in animal kingdom, even within a species: battalions of mongooses square off against each other, hermit crabs evict each other in the quest for the perfect shell, ravens rally their brothers to back them up in a rumble. Sounds almost like West Side Story. But all of this conflict actually leads to more peace and harmony, not less.

Guest: Lee Alan Dugatkin, author of "Power in the Wild: The Subtle and Not-So-Subtle Ways Animals Strive for Control over Others"
Photo courtesy of Harry Marshall/Banded Mongoose Research Project