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I am not completely sure, but they do clamp on and mention a point. However these are a common way of marking birds, so I don’t think it injures them.

I was curious about leg bands too and haven’t found anything myself. So then I wondered about wing bands, and found this BYC discussion with a quick search. Might help. https://www.backyardchickens.com/threads/inquiry-wing-bands-for-quail.797580/