The song finds Russell Mael asking how a Hippopotamus got into his pool. Well, we can't answer that but we can give you some fun facts about the large semiaquatic, mammal courtesy of The Encyclopedia of Trivia
Oxford dictionaries accept either hippopotami or hippopotamuses as the plural of hippopotamus but suggest the former is "... now generally taken to be either funny or absurdly pedantic".
Hippopotamus has been an English word since the 1300s. The abbreviation hippo arrived in 1872.
Louisiana senator Robert Broussard proposed the "American Hippo Bill" in 1910 which would have brought Hippos from Africa to get rid of a invasive species and solve a meat shortage in the United States. The bill nearly passed.
When Colombian drug lord Pablo Escobar's grand estate was raided, the military released the dangerous hippos of his personal zoo, not knowing what to do with them. They now thrive in the Colombian rivers. This means Colombia now has the largest wild hippo population outside of Africa.
Hippos cannot swim. Their bodies are far too dense to float. Instead, the water loving creatures walk underwater along a riverbed or use their feet to push off it in order to move about.
An average male hippo weighs 3,300lb. Of all land mammals only elephants or rhinos are bigger.
More people get killed by hippos each year than sharks, bears and lions combined.