5-Star Bird Houses for Picky but Precious Guests: Nesting Swiftlets

With no windows, the gloomy, gray building looming four stories above the rice fields in a remote village in Indonesian Borneo resembles nothing more than a prison.Hundreds of similar concrete structures, riddled with small holes for ventilation, tower over village shops and homes all along Borneo’s northwestern coast.But these buildings are not for people. They are for the birds. Specifically, the swiftlet,…