He said coloration plays an important social role in birds. But we're now beginning to realize that there's a direct connection between a bird's plumage and its overall health. By showing off their colors, the male birds aren't simply trying to attract the female's attention. They're also telling her they're free of disease, Bortolotti said. Bortolotti believes the connection between a bird's coloring and its health comes via carotenoids, pigments which are found in various foods.
Carotenoids affect coloration and are also vital for maintaining a strong immune system.
Bortolotti believes the link between a bird's coloration and its health holds great potential for keeping tabs on pollution. It's truly the classical canary in the coal mine. On Campus News is published by the Office of Communications, University of Saskatchewan.