I have several chicks that look the same, but would like to "mark" them in some way for record keeping, I have some leg bands that are sized for my full grown silkies so would still be a little big... I have heard of zip ties, but that kinda worries me, is there some sort of marker or something similar I can use to put a line on their wing or something that wont disappear and would last like a week, and then I'd re mark them. They are white chicks. Just wanting to keep track of who is who for records and such...