well, there is actually a little more to it...shrimp and prawns are actually two different animals, but the terms are often interchanged....i spent a few months in England/Europe and they seem to use the term "prawns" more, while in the US it seems to be more "shrimp"...and, often times, i think "prawns" actually does refer to the big shrimp i mentioned before - i may have just been at some less than top class restaurants that used the term to make their dish sound better than it was....someone feel free to correct me, or add more
look at me, being all schooled 'n stuff