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Science 4 April 2003:
Vol. 300. no. 5616, pp. 29 - 31
DOI: 10.1126/science.300.5616.29
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News of the Week

EVOLUTION:
Colorful Males Flaunt Their Health

Elizabeth Pennisi

Female birds of many species are attracted to particularly colorful males. Now two research teams provide experimental evidence that bill color, which is determined by pigments called carotenoids, is a true indicator of the male's fitness because carotenoids help boost the immune system.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)