Researchers at the University of Granada and the Max Planck Institute for Biological Intelligence demonstrated a link between urbanization and plumage colour of birds. Species that thrive in cities are less brown and sport more elaborate colours. These colour differences are probably due to differences in habitat structure and predation pressure: cities are less forested, have different background colours and a lower number of avian predator species. The study includes information from more than 1200 bird species and represents a clear example of the impact of urbanization on wildlife.