The observer can hide in a small wooden shed with viewing cutouts, and with a bit of luck watch beavers at work. In the Spessart mountain range in southwestern Germany, groups run beaver excursions to inspect signs of activity such as gnawed trees and dams. An impressive beaver colony can be seen on Lake Chiemsee in Bavaria. "The lodge is five meters long and three meters high," says Heinz-Jürgen Pohl, the local beaver expert. Up to six beavers live together here. "You can see into the lodge, especially in the winter when there are no reeds or leaves on the trees. There's a 50-50 chance of spotting a beaver," says Pohl, who offers guided tours.