Cockroaches are opportunists and chicken coops provide everything a roach could wish for (Shelter, food, water). Although chickens love to eat them, roaches are nocturnal so the two rarely cross paths and populations can easily grow. Being a great source of protein, it only makes sense to collect them for the chickens, rather than destroy them with no gains. In my shed where I store the chicken feed, I keep a tall jar. On the jar, I rub cooking oil on the inside rim and throw in some chicken feed. In the night, the roaches get stuck in the jar after feeding and I'll have 10-20 chicken-feed stuffed roaches for my chickens each morning. Just be sure you don't use pesticides around your home since they're going to your birds. American Cockroaches are 65% protein and packed with vitamin A and C. They're not indigenous to America and nymphs take 6-12 months to mature and once adults, they'll live another year. I've only been doing this for a short while so I'm excited to see if/when my cockroach population will collapse.