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Science 25 March 2005:
Vol. 307. no. 5717, pp. 1896 - 1899
DOI: 10.1126/science.307.5717.1896
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The Dynamic Gut

Elizabeth Pennisi

As snakes, frogs, birds, and other wild creatures attest, digestive systems need flexibility to meet energy demands as well as the challenges of environment, diet, and predators.

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