Scientists Breed Big-Brained Guppies To Demonstrate Evolution's Trade-Offs

An anonymous reader writes "Scientists have long suspected that big brains come with an evolutionary price ? but now they've published the first experimental evidence to support that suspicion, based on their efforts to breed big-brained fish. A Swedish team found it relatively easy to select and interbreed common guppies to produce bigger (or smaller) brains ? as much as 9.3 percent bigger, to be precise (abstract). But the bigger-brained fish also tended to have smaller guts and produce fewer babies."

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/XN-WTjaXhQc/story01.htm

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