The killer bunny (previously known as The killer rabbit of caerbannog, a reference to Monty Python and the Holy Grail) is an aggressive variant of the rabbit exclusive to Java Edition that is hostile to all players. Its fur is pure white with blood-red eyes that are horizontal, compared to a normal rabbit's vertical eyes. It can be spawned only by using the /summon rabbit ~ ~ ~ {RabbitType:99} command. It appears with a nameplate over its head reading "The Killer Bunny".

More facts here https://minecraft.gamepedia.com/Rabbit#The_Killer_Bunny