Cover image: Pictured is a peregrine falcon (Falco peregrinus) overlooking Chicago. Paul R. Martin and Frances Bonier found that dominant, urban-adapted bird species were more widespread than subordinate species in cities where they coexist, and that this pattern was absent in countries with developing economies. The results suggest that direct competitive interactions reduce the ability of urban-adapted, subordinate bird species to persist in cities, and that increased economic development may heighten the effects of competition on subordinate species, thereby reducing urban species diversity. See the article by Martin and Bonier on pages E11495–E11504. Image courtesy of Derek Zaraza (photographer).