It is not patentable to start with
Does not meet the criteria to be covered by a patent. A few things where a fly fails completely in the recognition criteria:
1) capable of industrial application? It's not really...
2) An inventive step, it "cannot be obvious to someone skilled in the art", ie. the inventive step involved in creation of this cannot be obvious to a fly tyer.
3) Aesthetic creations are not covered by patents.
Copyright is the route you would have to go down, and it would need to satisfy the recognition requirements for copyright. I have no idea regarding the postal method...
And for patents, it needs to be a registered patent to have any bearing at all on what people can cannot do with your invention...
Assuming I was taught right at uni then this is correct but i'll be more than happy to be proved wrong, not sure these lecturers tells you the truth all the time