Fish

Here is a BBC story about the intelligence of fish. Is intelligence morally relevant? If it is, then there are moral distinctions to be made among humans, some of whom are more intelligent than others. Humans value intelligence, which is understandable, since we have a lot of it; but we should not merely assume that it's linked to moral status. Unintelligent beings can suffer. Isn't that the main morally relevant feature of a being?