Is the plural for hippopotamus hippopotami?

I’m not really sure what the true plural of hippopotamus is. Honestly, I don’t really care. I do however find it very interesting to know that a group of hippopotamuses (hippopotami?) is called a bloat. Also interesting to know is that a group of giraffes is called a tower and a group of porcupines is a prickle. Want to know more? Check out this link from the U.S. Geological Survey’s Northern Wildlife Research Center, where they list common animal congregations and their names.  So the next time you are cornered by a barrel of monkeys (yes, that’s what they’re called), you can at least know what to call them.

Animal Congregations - USGS.gov