Fruit fly experiment as a science fair project?

My son is in 3rd grade and is crazy about insects. One of the ideas he came up with for his science fair project was “can/do bugs learn?” I did some research online and read about T mazes and fruit flies, but I am unsure whether this project is too ambitious for a third grader and his (PhD) scientist mom (geologist). Is there a different organism or method for testing about learning in insects that would be better? Are we in over our heads? Thank you for any help you can provide!