Watching fireflies, or lightning bugs, is one of the main attractions in the Sungai Lebam Wetland Preservation area. Catching sight of the synchronised blinking lights for the first time is a magical experience. Watching fireflies, or lightning bugs, is one of the main attractions in the Sungai Lebam Wetland Preservation area. Catching sight of the synchronised blinking lights for the first time is a magical experience.