Professor Leo Fleishman’s research focuses on the evolution of diversity in animal signals. Anoline lizards, like this small grass lizard from Puerto Rico, use visual signals to attract mates and defend territories. The main component of this signal is a colorful throat fan called the dewlap. Each species has a different colored dewlap, and the evolution of dewlap colors has played an important role in the evolution of species diversity. In addition to the colors humans can see, lizards can perceive ultraviolet radiation. This dewlap includes a distinct pattern in the ultraviolet that humans cannot see. Photo by Emilia Failing class of 2013.