When an insect lands on them, the trap snaps shut. Over the course of a week or so, the plant dines on its catch. He's the editor of the International Carnivorous Plant Society's newsletter. Prey includes a number of nectar-loving insects including flies, butterflies, and moths. Carnivorous plants look and act like other green plants - well, most of the time.
All green plants make sugars through a process called photosynthesis.
Plants use the sugars to make food and nectar. Nitrogen is a nutrient that they can't obtain any other way. The most common and widespread. Almost all green plants on our planet get nitrogen from the soil. Carnivorous plants can't.