Tod--I once met a fellow angler on a river who was all upset about a bank beaver that had moved into one of the better pools. And the beaver was a PITA. It would come out at dusk just as the fish were starting to feed, and if anyone was fishing the pool he'd run around and make a nuisance of himself with tail splashes and hissing.
The beaver came out when this guy and I were sharing the pool one evening, and of course shut down the fishing. As we walked back to our vehicles, he explained how big a problem the beaver was because the week before he'd seen the gravel bar below the pool "covered in dead trout" from which the greedy beaver had only eaten the eyes and brains. I tried to explain that beavers ate bark and point out the chewed alder stems all over the bank, but he was not about to believe any natural history from a "smart ass college kid".