We are on week three with our first little batch of broilers, my dd's 4-H project....wonder if any of you experienced folks have some ideas for marking the chicks to ID them easily?...since three go to the fair I don't want to use a sharpie marker or paint in case it doesn't clean off. We've used pipe cleaners of different colors to mark our layers but we're talking here about critturs with huge legs at three weeks and I'm a bit hesitant about using them on birds that grow as fast as these do...any ideas on short term ways to differentiate them?