GURPS Bunnies & Burrows is a tabletop roleplaying game inspired by Watership Down, about intelligent rabbits struggling to survive. It is an adaptation of an earlier game published by Fantasy Games Unlimited. Characters can be herbalists, psychics, storytellers, scouts, guards, or "engineers" who understand advanced technology like levers and flotation.
This sourcebook was created for use with the Third Edition rules, but can be converted to Fourth Edition without much trouble. You will need the GURPS Update conversion guide and GURPS Psionic Powers. Players can get help on the Steve Jackson Games GURPS Forum if needed.