Thank you, both, @neopolitancrazy & @MagicChicken .
I think next breeding season I *MIGHT* be in a position to have to hatch eggs from more than one breeding pen at a time. I'd vastly prefer to broody raise all the chicks (so far that's the only way I've raised the breeding birds), so was thinking if I wing band everyone ASAP, then I can slip incubator-hatched chicks under broody hens (if any are available) after.
So ... if wing banding a few days after hatch is more recommended, I still need a way to ID the fresh chicks.
We've noted with our line of Delawares that their toe webbing is tiny at hatch, so toe punching right out of the hatcher isn't an option.
What I could do is dye their fluff ... they are yellow so that would be easy enough, I could use different colors for different matings, or different places on the chick, depending ... then wing band when they're a tad older.
On a side note: I'd like to hatch earlier in the season this year, which will probably mean the earlier hatches would have to be hand raised because the broody "on switch" at this latitude seems to be about the second week of March for an April Fools Day hatch, not early enough IMO. I am NOT looking forward to hand-incubating and hand-raising chicks. Not at all.
This may sound dumb ... but I have vision problems, and I think I *MIGHT* be able to see wing bands better than leg bands because I can tuck the bird under my arm and stick my face right down into the bird's shoulder and take my time without the bird struggling as much as when I have to flip them over and hold their legs still. Right now, I need an assistant to deal with the zip ties. Part of my thing is that I totally lose track of something if it moves, and chickens move their legs a lot.