Have a look at these two video clips loaded by my student from Vietnam.
A properly designed BH, with proper sound system, lots of tweeters, fake nests and sprayed with Super Pheromone.
The final result for you to see after just 10 months into operation.
After 10 months into operation the number of birds increased from about 200 now 800 birds.
The BH owner is looking at 1000 birds once it is 12 months into operation.
Have a look at this clip:
According to him the use of super pheromone was one key factor in drawing more birds from his neighbours.
Nearly all those birds that passed by his BH will enter and stay as his tenant.
A very unusual progress but not surprise in Vietnam.
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