Beavers are back in Spain after mysterious 'bombing'

Bombing refers to illegally releasing wildlife into nature, to restore its presence. In Spain, two decades ago, someone let 18 beavers free in the Ebro river. Today, about 2,000 of the sharp-toothed rodents call the northeast region home. Some folks are pleased, others peeved. The World's Gerry Hadden reports from Aragon, Spain.