‘Hippopotamuses’ is a word that was MADE for Welsh!! In Welsh, I am told, the plural of ‘hippopotamws’ is ‘hipopotamwsiaid’ in case you were wondering!!!
www.bbc.co.uk/news/article... Small digs of the cave under Pembroke Castle, known as Wogan Cavern, have so far uncovered "extremely rare" evidence of early humans and animals - including the bones of a hippopotamus which roamed Wales 120,000 years ago.