Fire Ant Farm
Get off my lawn
Usually those with zip ties on the left leg will be for culling.
For whatever it's worth, anyone who does want to keep track of each bird by banding can do so very easily using numbered zip ties. Very inexpensive and easy to use (I especially like being able to size them just so for each growing bird - big enough to allow for growth, small enough not to slip above the joint and cut off circulation). They are sold in several colors at Strombergs - I switch colors as they get swapped out in growing chicks - helps me tell by eye who has and hasn't had their band changed, so I don't risk missing switching out a band that then causes injury as they outgrow it. You do need to tell them if you want certain sequences, though (e.g., 1-25 - vs. getting #s 75-100 like I did once when I forgot to say on the form). This was very useful to me as I kept track of my chicks, as I had a hard time telling them all apart reliably until relatively recently (and it would be even harder if there weren't so many different leg colors in the mix). I doubt I will continue to use them on the adults, but they have been very useful.
(No financial relationship to Strombergs, blah, blah, blah...)
- Ant Farm
Edit to add: The numbers DO wear off over time. Hasn't been a real problem for me as they have to be swapped out every few weeks anyway due to them growing out of them. If you wanted to use them long term on adult birds, you might need to switch them out/refresh them every so often.
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