There’s a glitch in Mo’Creatures that makes bunnies spawn everywhere, to the point that nothing else will spawn at all. If you’ve been overrun by bunnies, there is a simple fix.
1. Go to the options and set the bunny spawn rate to 0.
2. Remove all flowers. Sometimes bunnies will continue to spawn and breed even with their spawn rate set to 0 if there are flowers in the area they were spawning in.
Bunny population should be controlled after taking these steps. (And by controlled, I mean exterminated.)