Then replace "orangutan" with "mockingbird" if you like. There are tasks that humans are capable of that other creatures are not. Extrapolate this the other direction. I do not believe that humanity's current evolutionary state is the pinnacle of what intelligence can be.
I wasnt objecting to your intelligence theory. Its perfectly ok to assume there may be intelligences in the universe far superior to ours. I was referring to your comment on the "common objections to UFOs".