Here is a video of sky full of birds. How if your farm is one of them. The density of birds is unbelievable. If you want to start a farm here the chances of becoming a millionaire is high.This is what they call AAA area. If your farm here matches all the swiftlet friendly conditions ,you would have many nests in a short period of time. There trick is chose the right area, adapt to the local environment ( micro & macro ) liked by the birds here. You are on your way to a successful farm.