Zombie horse and killer bunny

These two mobs are in the game's code but do not appear, my suggestion is that just like skeleton horses, zombie horses can appear rarely with zombies riding them and they would be rideable for players. There should also be a way to put armor on them. the killer bunny could appear in a new blood moon event, which would happen randomly, during the event the player could not sleep and more monsters would be born, when he died he would drop the same as a normal bunny.