Something that I did at Belara BH.
This have something to do with those 90* nesting planks corners.
The old used corners were installed with an object to force the same couple to move to the flat areas while those that were still unoccupied were installed with triangular fake nests.
These explanations might help you to understand why:
Main purpose to install a gadget at the 90* corners, (already occupied) is to shift force the old tenants to erect their new nests on the flat areas.
If you continue to carry out this occupied 90* corners you will soon find out at the percentage of corner shaped nests are getting lesser while those with 180* shape starts to increase.
The more you cover (those with nests) the more you will increase the 180* shape nests.
What you should consider doing is to plan that every time you carry out your harvesting you focus on those 90* corners as your main target.
Get ready with the 90* covering gadget (plastic chains or steel plates) for immediate installation.
Yes you harvest the nest and immediately install the gadget.
If you do not do immediately install them you might forgot which corners were occupied since after nest harvesting the marking left are not easily traceable.
What about those that are not occupied?
My suggestion or idea is to install them with a triangular fake nest.
Yes every 90* corner should be installed with a triangular fake nest to act at your bait or trap.
At Belara BH I installed two rows of cross woods beam to beam area.
This exercise created at least 1000 new 90* corners.
What I did was to install a triangular fake nests.
Some were made of silicone and some were Styrofoam.
My main reason being to lure those new couples to quickly adopt this new BH.
I will allow them to use these fake nests for two cycles and after which you know what I planned to do.
You will soon see most of these triangular fake nests will be replaced with those gadget (plastic chains or plates).
The quicker they erect their nests the better the rate of birds population inside this BH.
The time will come where all fake nests will be totally removed and what will be left are those gadgets.
This should be your way of doing thing and I am sure you read my mind.
Use you common sense and understand that our main objective is to get any young couple that entered your BH to be your new tenant.
All that you need to do is to get the new couple to built their nest and lay their first egg.
Remember try to get them to lay their first egg.
I hope by now you know why !!!!