There's a show that was airing on either Discovery, Animal Planet or National Geographic about hogs. I happened to catch it one day, but darn if I can remember the name of it. It was really a fascinating show. Pigs are by far the smartest animal in the barnyard. They sit back and laugh at a dog being smart. On this show they had a project out at the university of Iowa where the AG school was working with PIGS to see how they remember and can process info. They set up a tv screen with a joystick attached that controlled a ball on the screen and the object was to move the joystick to the edge of the screen and when that happened a noise would sound and a door would open giving the hogs some treats. Once the pigs were shown how to do it by the human, it didn't take them very long at all to master it and get the treat each and every time no matter what side of the screen they changed it to.
After seeing that whole show, I was absolutely impressed with the abilities of the "lowly" hog. They deserve a heck of a lot of respect. I have also seen where they use them in France and Italy to find and root up Truffles, one of the most expensive foods in the world.
If you are ever going through the channels and see a show about hogs on one of those channels I mentioned, WATCH IT. It will give you a whole new respect for hogs, trust me.
Nalajr