updated 11:39 AM EST, Fri August 29, 2014

"Why would an animal parent kill and sometimes eat the kids? That's a question that inspires the research of evolutionary biologist Hope Klug."

Imagine leaving the kids in the care of their dad and returning to be told: "Sorry, honey, I seem to have eaten some of the kids." It sounds like a terrible nightmare, but that nightmare plays out all the time in the animal kingdom.

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