My opinion about using fake nests as a tool to increase the number of birds population in a BH stays.
I always encourage people to utilize this simple gadget and thrust me that at least 20-30 percent will be occupied in the first 8-12 months after installation.
Fake nest to me is a kind of tool to lure those new couple that just entered your BH to quickly adopt it.
If they wanted to start a family they need to build up their nest.
The female bird will not allow her partner to copulate or F**K her unless she is 100% sure that there is a nest to lay her eggs within 8 days after fertilization.
In order to get her to quickly say go ahead he need to adopt a ready made real nest or in a new BH those fake nests.
If you are very smart in selecting where the fake nest should be located plus you spray it with an aroma, you will soon have more birds entering your BH as compared to your immediate neighbour.
One of my preferred type of fake nest is the gel fake nests. They come in fully formed 180* shape and half shape 90* shape.
The plus point about gel fake nest is its soft and flexible.
It can be recycled if you know how to plug it out from a formed nest.
Have a good look at these pictures and look at how I managed to recovered a used fake nest.
First you need to allow the tenant of the fake nest to use it for at least two times.
The real nest above your fake nest will be much thicker and you can easily tear the fake nest out.