WebDragonflies and damselflies are animals that live on land and water. They are incompletely metamorphic insects. The life cycle has three stages: eggs, nymphs and adults. The nymphs live in water, and the emerging adults fly in the air. 蜻蜓屬於不完全變態的昆蟲,生活史只有卵、稚蟲及成蟲三個階段。.