bird cages that have holes?

[QuakerParrot]

I was wondering if any of your birds cages have any holes?In both of my bird cages they have a lot of holes all around them.I dont know why they make them like that.I have a problem with cockroaches, they will go it into the holes and lay eggs,i had to take the cage apart and put boiled water inside the holes so the cockroaches can die but probably more come after.Does anybody know what i can cover these holes with or anything that is good to kill cockroaches that is not harmful to birds?

 

[Thingamagigs]

Maybe show us a photo of the cages in question? Most cages have bars!

 

[QuakerParrot]

Sorry will try and see if my camera is working