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Images: Amazing Mima Mounds

  • Mysterious Mima mounds

    Mima mounds
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    CREDIT: Dan Schreiber | Shutterstock
  • April flowers

    Mima mounds
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    CREDIT: Washington State DNR
  • Pimply plain

    Mima mounds
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    CREDIT: Washington State DNR
  • California crenulations

    Mima mounds
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    CREDIT: Manny Gabet
  • Bumpy field

    mima mound lidar
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    CREDIT: Manny Gabet/Geomorphology
  • Modeling earthmovers

    Mima mounds
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    CREDIT: Manny Gabet
  • Mystery solved?

    Mima mounds
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    CREDIT: Zack Frank | Shutterstock
One of the world's weirdest landscapes, Mima mounds are found on every continent but Antarctica. These rounded little hills are spaced evenly on flat grasslands, covering the prairie like upended egg cartons. Their origin has defied explanation, but recent research suggests burrowing gophers, working individually for generations, build the mounds in 500 to 700 years.

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