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IMAGE: A house mouse from a southern population (left) is much smaller than a house mouse from a northern population (right), even when raised in the same environment, showing that the...
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Credit: UC Berkeley photos by Katya Mack
The European house mouse has invaded nearly every corner of the Americas since it was introduced by colonizers a few hundred years ago, and now lives practically everywhere humans store their food.
Yet in that relatively short time span -- 400 to 600 mouse generations -- populations on the East and West Coasts have changed their body size and nest building behavior in nearly identical ways to adapt to similar environmental conditions, according to a new study by biologists at the University of California, Berkeley.