Audrey Muratet and François Chiron present the current state of knowledge on how nature functions in an urban environment: its ecology. Cities are complex structures with many disparate living conditions. These can both generate and destroy pools of biodiversity. Cities are also organisms that develop, mutate, and die. In analysing these phenomena, this book affirms principles to overcome the ecological blindness of city dwellers and avert collisions with urban ecosystems. Ecologist and botanist Muratet explores the composition and dynamics of urban biodiversity. Chiron, a specialist in birds and mammals, studies those landscapes most transformed by humans.