A Terran Pig.
A Pig is an Earth animal that is often associated with farming. They have often been given the reputation of being dirty, and eating anything.
The SS Mariposa took several pigs with them on their initial mission in 2123. By 2365, the Bringloidi colony that brought them still had many with them, that were saved when their planet had to be evacuated by the Enterprise. (TNG: "Up The Long Ladder")
Insults
Pigs have also worked their way into many slang sayings. Being called a "Pig" is an insult in many languages.
In 2268, to convey the fact that she did not like him, Elaan called Petri a "Troyian pig!" (TOS: "Elaan of Troyius") The Nazi influenced Ekosians referred to those they pursued as "Zeon pigs!". (TOS: "Patterns of Force")
Doctor McCoy once said "In a pig's eye", to describe that he was being sarcastic, and didn't in fact believe something. (TOS: "Amok Time")
Foods
Several human foods are made from the meat of pigs. Bacon and sausage are made from pig meat.
- See Also: Denobulan sausage, Bacon and eggs
Related animals
Several animals similar to Terran pigs are known to exist, such as the Klingon Targ.
- The Tellarites have often been associated to pigs because of their snout-like face.