We normally never give adequate thought on the important of sound to these wild birds.
Do you realized that when those wild birds visited your BH it has something to do due to the sound you played and not your BH?
I was in Dengkil yesterday and have a number of visitors who happened to be the owner and a guest.
It was pretty late and I took them for a short tour and after the tour I showed them how brave those wild birds were.
Upon switching the sound on they actually came in a flock of about 10-15 and started to circle the monkey house.
Due to some unfinished tweeters connection my workers were still up at the entrance hole.
You will be very surprised what happened next.
These birds take no notice of my workers and they flew in and out of the entrance hole while my workers were busy to connect the cables.
"Dato have a look at those birds flying in and out of your BH. They were not bothered or scared with my workers fixing those tweeters." I was asking the owner to see what I saw.
A very interesting behaviour that tells us something when a good sound is being played as your external sound.
If they were attracted to the sound played and they entered the monkey house, will they fly into your nesting room?
To reach the nesting rooms they also need to fly from the monkey house area into the roving area and proceed to drop through the LAL and move into those lower floors?
Will these birds follow the so call unwritten law of a BH?
This is where your experience comes in.
The only way to get them to follow the house rule is to station a number of external sound tweeters at the right spots from the monkey house to the LAL and the nesting rooms.
If you have been toying with getting them inside you will understand what I wanted to touch on.
The key point is use their weaknesses towards a good sound and guide them into where you wanted them to anchor.
Their weakness towards good external sound is the key to your success.