This website claims to be breeding real cabbits, but seems to be breeding for deformity.
http://www.cabbits.8m.com/ Never mind the genetic impossibility of cross-breeding cats and rabbits, it sounds like another twisty cat breeder only the back legs are affected instead of the fronts. The site claims the hybrid offspring 'Walks as if it were drunk. It stumbles and/or wobbles' - spinal/neurological defects? Either it's a sick bonsai kitten type thing or someone is breeding some very sad cats
