The 5 Most Intelligent Animals in the World

We humans have always considered ourselves the "most developed" species; we have seen and regarded all other animals as much less intelligent and evolved creatures than us, up to the point of using them as tools for work, food or entertainment.
However, countless scientific and humanistic studies have confirmed that many animal species actually have impressive abilities, even more amazing of those of average humans. We're not only talking about sight or smell, but about social connections, memory, communication and even reasoning.