Position of fake nest.

From the above pictures, we can see that birds built nests on the upper part of the wood plank first.
I guess this is for both safety reason and hygienic reason. I guess the parents must think that the higher the safer and also don't want others to shit on their head or their nest.
Only when the space on the above role is full or scarce to find, then they will build their nests on the second row slightly lower if your plank are wide enough to accommodate.
Those of you who want to install only 6 inch width wood plank should think twice. Six inch might not be wide enough for the second row nests.

In the above house, at first, we installed the fake nests at the lower part of the plank (8 inch) near the speakers, as seen in most of the pictures from the internet. Results were not to our satisfaction as we aimed high.
Birds were not interested, they would rather built their nests themselves on the upper part as in the above picture.

When we saw that, we moved all the fake nests up to the upper part, after only around 1.5 months, most of the fake nests were occupied!
We used only food grade Silicone fake nests.







Thanks for the pictures from Khun Wor's blog at http://www.swiftletsourceofinformation.blogspot.com/

This technique is good only if you want to increase the birds population soonest and don't care much about the quality of the nests at this moment.

Believe it or not, it's your decision, I just recorded and shared to you what I found FOC.