There was a sequel, Racso and the Rats of NIMH, which was all right, and another, which I haven't read, because it has humans in it as characters, which considering the nature of the universe in question, makes me nervous (although now I will probably still buy it).
So I went to indigo.chapters.ca to look it up... and found... this.
...why? Why... WHY do they do these things?
'Scuse me. I have to go back to reading journals now to numb my brain in self-defence.