Bunnies and Burrows

Bunnies and Burrows is a role-playing game loosely (and unnofficially) based upon the novel Watership Down. Originally published by Fantasy Games Unlimited, it is now long out of print. It was licensed by Steve Jackson Games in the early 1990s and adapted to the GURPS rules, thus making it not only one of the most odd RPG settings ever, but also the first RPG to be licensed as a setting for another RPG.