I want to create public mob farms on my island. The only way I could do this is with donations. I need diamonds and spawners. When I get enough, my public mob farm will become true! (On my word, I will do this with your donations. I will never take these for my self.)
What i get from this. Is you are asking for dias. Animal farms are a waste. Almost no one will come and you will have more diamonds. Noty
But like Adrian said theres already warp mob and warp animal which (no offence) I would assume are both more popular than your 'public' animal farms.