It took villagers in Guatemala’s El Aguacate 25 years of living with clouds of flies on the streets, in their homes, on their faces and on their food, before they decided to act. According to them, the source is the Rosanda 2 chicken farm that began to operate in the entrance to their village the same year the flies appeared. After just my first hour in the village, I too was repulsed by the sensation of the hundreds of flies that crashed into me.