Some rice farmers in Thailand use a swarm of some 10,000 ducks to clean up their fields after harvesting. Known as “ped lai thoong” or “field chasing ducks”, the ducks eat the snails and leftover husks making it easier to plow all while avoiding the use of pesticides. – WTF Fun Facts
Source: Drone footage follows 10,000 ducks “cleaning” rice paddies in Thailand – YouTube