Harry Greene wrote:"Beavers invented hugelkuktur" - made me laugh.
We have a LOT of beavers at home. I've spent considerable time ripping apart their dams from a kayak to drain some of our land. We're in the wet, temperate northeast, but even so, this is a very interesting concept (working *with* beavers). My concern is that if you started planting trees that you wanted to survive around their home, you'd end up with pointy stumps.