Calling somebody else fat will not make you any thinner.
Calling somebody stupid will not make you any smarter.
And you’ve got to stop calling each other sluts and whores.
It just makes it all right for guys to call you that.

– Math teacher Ms. Norbury addressing a student assembly

Raised in the African bush country by her zoologist parents, Cady Heron thinks she knows about “survival of the fittest.” But the law of the jungle takes on a whole new meaning when the home-schooled 15-year-old enters public high school for the first time and falls prey to the psychological warfare and unwritten social rules that teenage girls face today.