Imported Beavers Gnaw Away At Argentina's Forests

Pablo Kunzle, a park ranger in Tierra del Fuego National Park on Argentina's southernmost fringe, shows off the trunk of a tree whittled down by beavers. "Unfortunately," Kunzle says, "they're almost the perfect machine." Once the tree is toppled, he says, it'll be used to buttress the beaver's dam or lodge.
Pablo Kunzle, a park ranger in Tierra del Fuego National Park on Argentina's southernmost fringe, shows off the trunk of a tree whittled down by beavers. "Unfortunately," Kunzle says, "they're almost the perfect machine." Once the tree is toppled, he says, it'll be used to buttress the beaver's dam or lodge.