Ants seem relatively smart. I've been having ant problems in many places I've lived, and I'm fascinated by how quickly they learn and adapt. In the spring they arrive dump and inexperienced, walking here and there. But when you start killing them, they come up with different strategies to not get detected.
I am inclined to think of an ant hill as a living being. In that context they show a lot of clever behavior. A single ant is not very smart though but the same applies to parts of my body. Without the other parts they don't get much done either :-)
