Sir Sacabambaspis
Rest in peace Eda ~ 2018-2024
I use colored zip ties for chicks after they reach 3 months and make sure it's got a good but of room but can't fall off the foot, all my breeders have their own color so I know what color is which. I'll also mark eggs with their parents zip tie color when I do mixed hatch and then I separate the eggs at lockdown... Works pretty well tbhThey cost money and usually you're marking chicks from hatch to adulthood. That means keeping an eye on them so they're not getting tight and changing them as they grow.
There's also a chance they'll come off depending what type.