Banished to a remote Idaho valley, beavers created a lush wetland
Definitely a good thing, but i cannot think of any other mammal that so enrages land owners.  If you have beavers on your land, you are now on <i>thier</i> land.  There just isnt any way to prepare a house, road, field or any other area the beavers want to inundated.  You jut have to give up and biuld elsewhere.