We need to use leg bands to ID various cohorts of chickens. So far we've been using the numbered plastic bandettes, but they fall off all the time and I'm left guessing as to the age of my hens. I've used the spiral type, but I had a chicken injured by one when it came off partially and the sharp end of the spiral stuck into her leg. Does anyone know of bands that: A. Stay on!; B. Don't injure the birds; and C. Are colorful enough to see in a group of quickly moving birds? Thanks!