[SlowBoat407]

FACT: The earth's climate was once far warmer than it is today. At one time there were lions and hippotamuses in England.

I am appalled at your butchering of the facts and your reckless disregard for even the most basic tenets of scientific method.

It's "hippopotami"

[ZULU]

Well, if you want to get technical, it should be Hippopotamoi and Hippopotamos from the Greek - "Hippos" Horse and Potamos "River" the -i suffix is a latin masculine Nominative plural and isn't used for Greek stem words, including Anglicized Greek Stems. The -oi suffix is the Greek masculine Nominative plural noun suffix.