I have looked at several books and have visited many internet sites. What an interesting question.
Normal plants are at the bottom of the food chain.
I think we should go for the major source of energy for Venus flytraps, which definitely is the sun, not the animals they trap. So keep Venus flytraps on the bottom of the food chain with all the other green plants, even though they have this interesting little carnivorous sideline. Like life in general, they don't neatly fit into the categories that we humans make up for them. See the Venus Flytrap References Page . Created for the Museums in the Classroom program sponsored by Illinois State Board of Education , the Brookfield Zoo , the Illinois State Museum. , and Kildeer Countryside CCSD 96.