I rememeber reading about how wild pigs do a lot of damage on farms in Texas. There was this guy who was familiar with quadcopters, and added an IR camera so he could see them better at night. He'd find them, and use a radio to guide his friends (on quadrunners) to the herds, where they would use IR scopes on rifles to shoot them.
All was fine until they began selling their services to the neighbors, and when it became a business, the FAA stuck their noses in. Point being, critters show up pretty good at night with IR, even a cheap IR camera.