Do carnivorous plants that can eat insects really exist?

There are about 300 species of insect-eating plants in the world, and more than 30 species in our country. Insect-eating plants all seem to be very sensitive.

Take the pitcher plant (Nepenthes): at the tip of its leaf there is a pouch shaped like a jar, and from the bottom of the jar flows sweet, fragrant nectar, while the mouth of the jar has a lid. When a greedy little insect crawls into the jar, the mouth of the jar closes, and the little insect that has fallen in is slowly turned into a nutrient liquid and absorbed bit by bit by the wall of the jar. These plants live mainly not on nutrients from the soil, but by eating small insects.