You know the Rodents of Unusual Size (R.O.U.S.es) from The Princess Bride? As a kid, I just logically assumed that no rodent could possibly be that big and they were a as made up as the countries of Florin and Guilder.
My child logic wasn't completely off-base, but what I didn't realize is that the term "rodent" doesn't just apply to rats, mice, or squirrels.
Even the common beaver is a rodent and they are pretty big!