wild inside...

"Such a horrible idea has come into my head, Su."
"What's that?"
"Wouldn't it be dreadful if some day in our own world, at home, men started going wild inside, like the animals here, and still looked like men, so that you'd never know which were which?"
"We've got enough to bother about here and now in Narnia," said the practical Susan, "without imagining things like that."

-Prince Caspin, Lewis