D9 "Prawns" Reference is South-Africa Specific

In the 2009 film "District 9," the alien species are referred to (in a derogatory manner) "prawns" by humans because of their distinct features (I don't know the precise term - but the aliens have little leg-like appendages, sort of like whiskers or tentacles, that come out of their chests and above their mouths). I had thought, up until reading the TvTropes.com page on D9, that prawns meant shrimp (as prawn is another word for shrimp). However, it turns out that the name refers to a king cricket species commonly found in the Johannesburg, South Africa suburb of Parktown called the Parktown prawn. I can definitely see the resemblance it shares with the D9 aliens, but I don't think it was far fetched to think that the aliens look like shrimp. Either way, I found this an interesting little bit of trivia; I never would have thought to question my assumption regarding the movie's use of the word "prawn" -- my discovery of this fact was simply fortuitous.

a shrimp

a "prawn" from D9