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Science 15 June 2007:
Vol. 316. no. 5831, p. 1560
DOI: 10.1126/science.316.5831.1560
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News Focus

PALEOANTHROPOLOGY:
Swapping Guts for Brains

Ann Gibbons

The idea that as our ancestors began to eat more meat, they took in enough calories at each meal to permit their guts to shrink, saving energy from digestion that in turn helped fuel the brain, is getting new support from studies of birds, fish, and primates.

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