Multiple choice general knowledge Pick the odd one out... Great White Hammerhead Dolphin Shortfin marko Reveal answer Fill a bubble to check yourself C Correct answer Explanation Dolphin is a marine mammal, not a fish. Great White, Hammerhead, and Shortfin Mako (misspelled as 'marko') are all shark species. Being warm-blooded mammals that breathe air, dolphins are biologically distinct from sharks.