Back in the mid-90's, I was camped with my wife & two young boys right next to the portage from Quetico Lake into Conk Lake.  It was "0 dark-hundred" and I was fast asleep... but not my wife & kids.  They were terrified of the bear that was stomping around in the water right next to our camp.  Ultimately, they woke me up and forced me to "go outside & scare him off."

I hadn't heard a thing but would get no further rest until I investigated. So, out I went, stumbling around our site with a flashlight.  All was good until I was startled by an explosion of water right beside me. We all know the rest of the story.  When daylight broke out a few hours later, I looked around and we were clearly camped right on the access trail for the army (navy?) of beavers who were harvesting trees just on the other side of camp.  There were quite a number of them and they were not happy about our site selection.

Not sure that my family (well... my wife, at least) believed me, though, when I first went back in & told them it wasn't a bear.  They insisted upon "moving along" to a different camp.

Jimbo   8-)