The secret of Nimh is hemorrhoid research.

I think if the animals got more intelligent they would empathize more with the scientists who had hemorrhoids. Don't you think hemorrhoids are subterranean creatures that feast on underground beetles under the savanna of Africa? Watch your feet you don't want your ankles to be nibbled at by them hemorrhoids! They come in all sorts of colors: red, blue, yellah. They be some sneaky critters always popping up when you don't expect them too!