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Did you know that there are 583 species of carnivorous plants around the world, which derive nutrition by eating other animals like insects? They are usually found in areas with poor soil quality, like marshes and bogs, that cannot provide these plants with all the nutrition they need. These soils are known to be especially poor in nitrogen. Hence, the plants have evolved the ability to catch and digest insects, which are a good source of protein -- and thus, nitrogen.