There are many ways of attracting those swiftlets into you new BHs.
One of the most preferred method is to provide a water pool on the roof top.
Base of normal theories, those swiftlets will have a water source to drink or wet themself. If you rear some water plants in them, they might also produce insects for food (swiftlet).
Having a water pool on the top of the roof can be a very big headeach especially when those water seep through your birdhouse cement pores or minor cracks.
Once they seep through, you will have a terrible moment with your nesting planks and not to forget your whole BH floors will be wet.
I was in a BH in Seberang Prai yesterday and this was what happenned. You can firstly see those pool of water on the floor in the BH. When you look up on the ceiling, you can see those wet ceiling beginning to soak those wooden planks. First the top part of the wooden planks are wet and later the whole plank will be soaked. Once wet and not properly dried, those mould (fungus) will start to grow on them.
Birds hates these fungus.
My advise is be carefull before you decide to have them in your BH.
Make plans to ensure that they will not leak. Get an expert to give you all the precautions you need to do before you pour those water into the pool.
I am sure there are ways in preventing those water from seeping through.
The best is to avoid having them if you can.
If you already built them just dry them up and apply whatever necessary, like a layer of water proof paint or a specially made canvass or perhaps a fibre glass boxes, to ensure that they are leak proof.
Just imagine a nicely built birdhouse but the roof is leaking?
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