Dude... I had a buddy that was fascinated with rats and would do all sorts of intelligence tests on em. The best one I've seen is, ahh screw it 1 sec.

Hah, my friend had a couple of rats a while back and they were super smart. One would help leverage this hanging object so the other could climb up on it and get to the food, once one got to the food, the rat then reached down and helped the other rat up onto the stage. It was fascinating to watch how they teamed up to solve problems.

Their collective intelligence and teamwork is ridiculously good.