Beware the beavers. They can be vicious.
I remember seeing a tree downed by a beaver. I was shocked at the size of the wood chips they bit out. Their jaws must be extremely powerful.
Somewhere in the archives of the U.S. Army Corps of Engineers is an accident report about an employee who was viciously attacked by a trapped snapping beaver. The critter had become trapped within a cyclone fence when the river went up then went back down. When the employee opened the gate to help the animal get out the critter thought it was trapped and attacked him. There were many, many stitches and a long round of rabies shots. The leg lacerations were pretty darn serious.
So, if you are ever confronted by a snapping beaver stay clear.