You do occasionally get mutant drones .. sometimes white ... there are various flavours, none are long lived .. some like this one, have wings that won't lie flat to the body and may not be able to fly. Usually more lost pigment areas than seen on this one. I've only ever seen one at the association apiary - pointed out to me as an Albino Drone. I don't know much about them - it's to do with recessive genes - google Albino Drones - bound to be something about them on the net.