Cockroaches live in colony as many as few thousands in a single dent. They craw our during the night and find food.
Don't take them likely. You may not see them in your farm it doesn't mean they are not they. You would be surprised few hundreds of them maybe hiding behind the nesting planks.
Cockroach eat Nests and bite baby birds. Few days old baby birds without feathers are their favorite. They can't protect themselves and prone to get attacked.If you see dead baby birds on the floor chances are cockroaches have invaded your farm.
They are silent killers, invade your farm during night when you least expected.
Good Swiftlet farming All!