Don’t most animals have a tracking chip implanted in them these days?
Wouldn’t it be easier to just scan them and not worry about the collars?
No, you just send out the "self-destruct" code via satellite and clean up what's left.
The problem with the chip is that they don’t all work with the same scanner. My neighbor lost her cat and when she reported the ID chip information she was told that the only place that used that particular chip in the area was the shelter where she adopted the cat and that unless the cat was returned there, it was useless.
Eventually they did find the cat over a year later, largely due to a persistent vet. The vet felt the chip when the new family brought her in and he contacted local shelters for the different scanners.