You Are What You Eat

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Science  15 Jan 1999:
Vol. 283, Issue 5400, pp. 335-336
DOI: 10.1126/science.283.5400.335

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The ratios of various stable isotopes in an animal's body reflect closely the corresponding isotope distribution in its habitat. In his Perspective, Kohn discusses the expanding collection of research results obtained with stable-isotope measurements. Such data should be extremely useful for extending our understanding of ecology, climate, and animal biology.