Once you can detect their white shit spots on the floor and those dark colored globules all over the floor your mind will start to visualize how they entered your BH and start catching your tenants one by one.
You will then become very angry and start making drastic and stupid decisions.
Stay calm and try to tell yourself that this is one small part of becoming a BH owner.
To me this is a kind of challenge that every BH owner will face.
There are many many more challenges that will be similar or may be more serious then this.
Good example when you inspect your BH your water pipe connecting your humidifier leaks and the whole floor flooded.
After two to three weeks with too high humidity your nesting planks on the affected floor are covered with fungus.
Or one day you entered your BH you can see lots of baby birds on the floor and you just could not understand what is happening.
Or maybe one day you entered your BH the whole sound system went dead and you can see that those bird shit spots on the floor are drying and the number of birds inside went to almost zero.
You have to be prepared for all these so called common problems and once they occur you need to know how to tackle them.
Try to stay calm and do not make any nasty decision without thinking about the consequences to your tenants.
Coming back to the owl problems you need to stay calm and list down all the possible methods to prevent them from coming inside of stay on the roof areas.
I have this small idea on how you might want to prevent them from entering your main entrance hole.
This single idea works if you do it carefully or perhaps combine with other gadgets.
This idea have been proven but just analyze the pros and cons.
The idea here is to prevent those owls from entering the main entrance window.
You know that they are larger than your swiftlet but they usually enter from the bottom part of your entrance hole.
However you know that your swiftlet usually will enter mainly from the top part of your hole.
So you make the gap of those steel wire or bar smaller while the top larger.
The wing tips of your swiftlet is about 10 inches so I recommend the top gap to be 10 inches or higher but at the bottom the gap should be smaller say 3-4 inches.
May be you should consider to install some sharp spikes or nails at the base of your entrance hole?
No matter what you have in mind try not to put steel bars or wires too closed to each other.
At the Cenih BH the owner opted for about 3 inches gaps and no bird can pass the gap.
If you wanted to get more information call this number 017 7551318