Excellent article! I recall watching a video on Youtube recently about a similar war of extermination against...goats? I think? That had overpopulated islands owned at the time by Britain. It was similarly ineffective at first, as the goats eventually learned to hide from the helicopters.

So, they attached tracking devices to "Judas goats" who would then unwittingly lead the exterminators to where the other goats were hiding. They would kill them all except for the Judas goat, then follow it to the next hiding group of goats.