Why do animals do what they do? From how creatures rear their young to why they choose their mates, animals have unique ways of dealing with the world around them. Animal behaviorists and psychologists study the patterns of thought and action that allow creatures to avoid dangers and obtain the resources to survive. And, by learning the minds of these animals, many of these experts believe we can understand the human brain better. These 15 professors are the groundbreakers who are developing bridges between the animal and human psyche. While some specialize in animal-human bonds, others are finding new ways to map the most fundamental behaviors common to all living beings.