I breed pigeons that are bred and trained to steal other pigeons. AMA
Little background: Thief pouters have been around for centuries. In the beginning, they were used to steal racing pigeons from others as the birds returned home.
This practice was eventually outlawed, naturally, since no one likes having their stuff stolen. That's when thief breeders turned on each other and started (sometimes not so) friendly competitions to see who could capture whose birds. If someone else's thief caught your thief, they got to keep it. Those are the rules of the game.
As the hobby spread out to other countries/continents, there were fewer people to compete with, so breeders started practicing what is called "zuritero" - which is where they compete to see who can catch the most feral pigeons.
While catching ferals lacks some of the excitement of trying to steal other thieves, it does present its own challenges. Ferals are much more wary of people and pigeon lofts than a domestic pigeon would be, so it can be hard for the thieves to actually lure them into the loft.
AMA about pigeons, thief pouters, or whatever you want to ask me - related or not.
Edit: Here's an article National Geographic did on the hobby in Scotland. It's pretty big over there.
Edit edit: Hope this counts as proof?
Edit x3: It's late now, the questions are slowing down, and the wife is demanding I get off this ole machine and pay her some attention. I'll check back sometime tomorrow to catch any stragglers if they have novel questions. It's been a lot of fun, you guys. Thanks a lot for being here!