Our chickens are sporting a new look, bracelets. To keep track of which year the chickens were hatched I bought chicken bands. Last year's birds now have red bracelets. I really like the black sex link birds I have now and have three more coming along. As the birds get to be full size it will be very difficult to tell them apart, hence the bands.
I crept into their coop at night and slipped the bands on while they were roosting. They got a little stirred up but nothing like I thought they would. I think they like tolerate them.