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Insectivorous plants are carnivores or meat eaters. The reason they need to trap and eat insects is because they usually grow in poor soil that has very few nutrients. Thus, they evolved to be insectivorous. They use a combination of photosynthesis and energy derived from the insects they consume, to survive. There are many kinds of insectivorous plants: pitfall traps, flypaper traps, bladder traps, snap traps, and lobster-pot traps.