So what you are saying is that the same ear structure developed in two different branches of the evolutionary tree?
The chances of something like that occurring without intelligent guidance is pretty darn close to nil.
Natural selection easily explains homologous structures forming for a certain structure that has survival benefits for the population.
Since we see the development of the structure, it does not matter what the "chances" are. What evidence do you have for a " intelligent designer", besides a hunch.
Evolution says the designer is natural selection.