Brad explained it to me. Kreelies don't grow up to be smart unless they're raised by smart Kreely parents.
What, they can't learn stuff when they're old?
Sort of. He said that unless they get this special infection during their second growth spurt, they'll never get smarter than, say, a really smart dog.
Dogs are what puppies turn into if you don't eat 'em before they go all stringy.
I'm just saying. . . you give me a choice between a Kreely and a dog, I'll eat the Kreely every time.