Perhaps that would be an interesting area of study. I think the lack of dexterous limbs probably inhibits the pig's ability to solve certain problems they would otherwise be mentally capable of tackling.

I've seen an experiment in which pigs controlled an object on a screen, using a 'joystick', by controlling it with their snout. It certainly looked as if they were demonstrating a level of intelligence.

I read about that study as well, it's what I was thinking of when I made the previous comment! Cool stuff! Do you have a link by any chance?

All I know is that it was a TV programme in the UK; sorry, I know that's not very useful!

We had two pigs together with our horse and they were really creative at figuring out how to open doors and get into the food containers.