Why does a Caribbean angelfish sometimes resemble its Indo-Pacific cousin, even though they have never lived in the same ocean? Why do coral reefs harbor such a wide range of stripes, spots and patterns? A study conducted by the University of Liège reveals that this explosion of color patterns is not the result of chance. The more species that make their home in a reef, the more varied the patterns, and fish from different oceans often end up looking alike, guided by the same deep biological con...