Ahhhh, beavers. 
Yep, one of the most interesting animals around. As a kid I'd spend a lot of time sitting under a tree by some hidden little pond, watching a beaver at work. I sit ever so quietly. Then the ol' boy catches a whiff of me and SMACK!!!! He whacks the water with his tail and glares in my direction. I remain still and he goes back to work, gnawing on a tree and then patiently towing a branch through the water past me to his hut. "You just sit there, kid, and I'll continue my task without biting your leg off with my gnarly teeth..."
 I was once 'hunting' on a lake in the Copper Valley (I was really just lazing in the sun and listening to Trumpeter swans) when all of a sudden two bears came out of the trees, a medium size brown one and a  black one. My eyes popped wide open and by golly, they were not bears at all, but monstrous beavers! Never saw anything like them before or since. Guys used to get beaver castor in the mail to use as bait for their snares. Stunk up the mail.