Biological invasions involve the movement of species outside their native area, to different environments in which these species have evolved, and to which had already been adapted. These abrupt changes of environment can represent a good opportunity to study evolutionary processes. This video shows the results of a study conducted by researchers at the University of Vigo (Spain) and Coimbra (Portugal) to study the evolution of the breeding system of the invasive species Oxalis pes-caprae outside its native distribution range.