Over here in the UK it's been known for people to use leg rings to identify chick's like pigeons, quail etc
https://www.ebay.co.uk/itm/25539462...UtXoz1LTnS&var=&widget_ver=artemis&media=COPY
https://www.ebay.co.uk/itm/25539462...UtXoz1LTnS&var=&widget_ver=artemis&media=COPY