We're in Lopburi in Thailand. It is a tourist hotspot, but it's also a mecca for monkeys. We're on patrol with the police. This is a specialist unit set up to tackle them. There's been an explosion in the population. An increasing amount of them are attacking cars, visitors, and market stalls. Some will be taken to shelters, some will be sterilized. The problem is there's about 3,000000 of them at least.