City Mice Smarter Than Country Mice
Study finds that human activity has made some animals evolve larger brains
By Kevin Spak, Newser User
Posted Aug 23, 2013 2:31 PM CDT
A meadow vole is seen in this file photo.   (Wikimedia/Needsmoreritalin)

(Newser) – City dwellers have evolved bigger brains than their rural counterparts, a new study suggests—at least among white-footed mice and meadow voles. University of Minnesota biologist Emilie Snell-Rood looked at the skulls of 10 species of small mammals, and found that in those two species, specimens from urban environments had larger brain compartments than their rural counterparts, the New York Times reports.

It's not that the mice are taking in the big-city arts scene. Snell-Rood hypothesizes that humans forced the creatures to evolve by radically changing their habitat; only those who were the best at learning and adapting survived. Snell-Rood found the same kind of brain growth in two species of bats and shrews from rural environments that had also been dramatically changed by human activities. "The results are exciting," says one biologist, noting that Snell-Rood is the first to show animals' brain sizes increasing outside of labs.

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johnbettr
Aug 24, 2013 4:01 PM CDT
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CharlesP
Aug 24, 2013 1:08 PM CDT
I do not doubt that evolution was in play. BUT, It was PROBABLY THE CHANGE IN THE ANIMALS DIETS! It the wild, they were mostly eating seeds, plants, etc. In the city, they were eating the same foods humans eat! (By eating foods left out, food in poorly made cupboards, food in trash (which was NOT in plastic bags, in the past). It is proposed that humans ALSO got bigger brains, when they became "hunter/gatherers", when before that they had just been "gatherers". Also, the predators in cities are different from the mouses predators in the cities (snakes, birds, were in country. Cats, humans, in cities.)
orlandojonny
Aug 24, 2013 8:51 AM CDT
Study funded by tax dollars no doubt...a good example of government waste