This feature is associated with a recessive mutation that results in four ear flaps (additional flaps do not lead to additional organs of hearing). Sometimes, due to these duplicated ears, a cat’s eyes may be reduced in size and its jaw slightly undershot. Carriers of this trait can be relatively inactive and lethargic and may struggle with possible interferences of brain functioning. This mutation also seems to be lethal, with most kitten carriers actually dying in utero. Most cats survive to be healthy if they survive childhood so maybe make it so that the survival chance has to be kept higher for the cub to survive