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Insects and rodents can also carry and spread disease from one area to another. Flies are drawn to excrement like rodents are attracted to grain. Therefore, you can imagine how easily they can spread disease from infected excrement and contaminated feed to your healthy birds.
Excrement on floor
Infected excrement from a sick bird can attract flies who can spread the disease

Rodent next to feeder
Rodents can contaminate feed and spread disease
What are the symptoms of poultry disease?