All species display intelligence, but humans tend to place themselves as superior over other species. One of the reasons for this is the way intelligence is tested and a lack of agreement between professionals as to what intelligence is. It is topic that has interested researchers for many, many years. Though there is a lack of agreement on the topic there are some common themes including; types, how many types there are, what they mean, how it is represented in the brain and the role of nature versus nurture.