LOL that doesn't prove that pig can think. You've made a false assumption/conclusion.

Listen to my humble comment.
Animals can't think. Only humans can think because they are special. Humans are made to rule, to govern and control the universe as they can. And among humans there are rulers.

Proof?
1) If animals, can think, why they don't think to enhance their life like human do?
2) Humans can kill more animals(tigers, birds, crocs..etc) but they don't. Why? Is it because of the "rules" made by human's rulers? Or is it because of the bad consequences seen by humans of their acts? Or is it because they have the emotion not to kill them? The answer is.. depends on the person among the humans itself. Because humans sometimes can think deep, sometimes cannot. Sometimes affected by emotion such as symphathy, greed, love, hatred.

So is human same as animal? Physically inside, yes comparing to some animals. But animals can think? No. Only human can. So we can't compare animals' rules with humans' rules.