There was once a game called Lugaru. I'm pretty sure I installed it but it crashed for me. It involved bunny ninjas fighting eachother as well as wolves, rats, dogs and cats. the moves mixed procedural animation and ragdoll physics.
but now, there is a sequal. Rockpapershotgun have put up an interview with Aubrey Serr, Wolfire’s lead artist and John Graham, Wolfire’s self-proclaimed coffee operations officer.
http://www.rockpapershotgun.com/2010/03/18/bunny-brawler-wolfire-talk-overgrowth/#more-27182I'm really quite excited by this. Not only is it a game about ninja bunnies, but it actually looks like a proper fun game, with brilliant editing potential, which includes a remarkably easy to use custom animation editor which is really quite rare.
Oh you should also look at the developers youtube channel: Wolfire Games
http://www.youtube.com/user/WolfireGamesand their website of the same name
http://www.wolfire.com/