How Beavers Helped to Build America

 "Beavers, once abundant and widespread in the Northern Hemisphere, helped to forge the ground underneath many Americans’ feet.

The team behind a new study used ground-penetrating radar to detect buried beaver dams.

The study, published in the January 2012 issue of Geology, reveals how beaver activity up to thousands of years ago affected sedimentation and left its lasting mark within North America's ground."
via Discovery News / more