The whites of their eyes

This post from Ambiance is really interesting. I hadn't ever thought that only dogs and humans seem to understand that you can seek visual cues from another person's eyes. I did know that only dogs seem to understand pointing - that when a human points at something, you look toward where that person is pointing, not at the finger itself. Other animals (cats, for example) will inspect the finger that is pointing, if they have any interest at all in bodily expressions.