Actually, when was in the UK, I met a guy who trained birds…hawks and owls I think. He had a business where he would come to your location and “fly” the birds around a few times to scare away other birds–“nuisance birds” like pigeons and flocking birds like…I have no idea…European Swallows?
Some of his work was in London getting rid of pigeons from various buildings. Another job he had was at RAF Mildenhall, home to USAFE’s KC135 and KC-10 wing. He’d take his birds (one at a time I’m pretty sure) out around the runway and fly them. Not sure how often he did it. He had a contract with the air force so it was probably a periodic thing. Evidently it worked and the USAF was happy with it. They took him up in a tanker for a training mission. He had lots of photos…really cool.