That mexican looks similar to the mottled I'm working on right now. All the bands make me sad, I've been duck hunting since 1967 and still haven't shot a banded anything although I have had a few collared wolves on my bear baits, wouldn't mind killing a few of those. I do pass on mallards most of the time as you know, that's probably part of the problem.
Don, I target mallard because we have a ton of them, and they carry the most bands in my area. There is a biologist who colors all the numbers in the band. We all know instantly where the bird is banded based on band appearance. He bands a lot of mallard. Its a funny thing with bands. I will go 4 or 5 seasons without killing one, and then I will kill like 3-6 in a single season. No rhyme or reason to why either. Location is huge though when it comes to bands.
The band on the preening hybrid is actually my first band. Its so thin, it would likely fall off if on the lanyard long enough. Only 1 number can be read on the band its so worn. Being my first, I was so disappointed I couldnt report it. My grandfather (the mean one who was a true artist at heart) was on his death bed. I told him about it, and he said we can figure this out. Pretty sure the conversation started something like this....
"You dumb shi*, go get a clear plastic cup, a wooden dowel and some acid and meet back here at the house. I will walk through how to get those numbers." When I asked how he knew to do this, he said thieves would sand down or scrape off the numbering on old aluminum vin plates. This is how they would retrieve the vin numbers on stolen cars. So I showed up with all the supplies and he walked me through the 50/50 water/acid mix, then put the band on the wooden dowel, swirled in the clear plastic cup for about 60-90 seconds when sure enough the bubbling of the numbers started. It was so clear, I read off the numbers, he wrote them on a piece of paper and we reported the band together. It was one of my final memories with him before he passed. I say it all the time, it might be the lightest band I have, but it carries the most weight.
I have like 160ish pigeon bands as well. Had a buddy who owned a dairy that was overrun with pigeons. Federal gov't even said to get it under control or get shut down. It was within city limits, I got put in handcuffs so many times but as soon as I presented the federal documentation in the office, there was nothing local law enforcement could do. I always felt pretty bad when I picked up a banded homer from someone's coop. It was never my intention, but they gobbled up the dairy corn as much as the nasty city pigeons.
Ive seen collared animals before. Every time i see one, I always think theres the banded version of a 4 legged creature. Do they want collars back if an animal is shot with one? I know GPS trackers on birds get sent back in exchange with the map of the birds travel. I would gladly hand over a gps tracker for that information.