Just like we teach people how do things by demonstrations, in the same way ants teach them. I wonder if they have sufficient intelligence/complexity to understand and teach how to find food. But, indeed researchers have found that ants teach each other about how to find food. Ants collectively are quite intelligent. They can build colonies, collaborate, have definite hierarchy and now they can teach and learn too. I guess we have enough to learn from ants. The field of collective intelligence will just get hotter.
Check this article: http://www.livescience.com/animalworld/060111_ant_lessons.html