To give an illustration of what I mean with downward ear, here's an illustration taken from mtrakholisova's Pinterest.
I want to make a species with downward facing ears. They cannot be moved facing upward or horizontal, but can be slightly moved upward (I hope you get it).
What I have in mind initially is that they evolved from a fox (furry ears), but this doesn't explain why the ears evolved to face downward (rather than horizontally).
There's magic in this world, but I would like to explain this using science, or very little magic. You may use magic, but the process on how the ears started to evolve downward should be as natural as possible.
I expect answers to explain the advantages of having this kind of ear (or disadvantages of not having downward facing ears). This species does not have to evolve from a fox, or have furry ears. I'm only interested in how this type of ear evolved.