Zygonyx iris, or commonly known as iridescent stream glider, is a common species of moderate to fast streams with rivulets in semi-open terrain. It is a dark metallic blue dragonfly with brown eyes and broad humeral stripe in yellow thorax. It breeds in the swift rocky streams. The larvae cling on rock surfaces in fast-flowing streams and rivers by using their long legs and twin claws (Orr, 2005). Seemingly, the larva migrates to second or third order streams during their late instars from where they emerge. Z. iris is a generalist predator as it consumes epibenthic prey taxa in proportion to their abundance in the environment. This dragonfly tirelessly flies back and forth across a beat along a hill stream and rarely perch. This genus was found at Sungai Tan Hain, and Sungai Papan. It is widespread throughout the world.