Multiple choice general knowledge Which one is correct? Hipopotamus Hippopotamus Hippopotames Hipoppotamus Reveal answer Fill a bubble to check yourself B Correct answer Explanation 'Hippopotamus' is the correct spelling of the large semi-aquatic mammal. The name comes from Greek 'hippos' (horse) and 'potamos' (river). Common errors include omitting the second 'p' or misspelling the ending.