I now know that beavers also tear up water lilies and even use the rhizomes to clog pipes. Mine seems to be a single and he is almost exclusively nocturnal. Neighbor was unable to trap him out this past winter, but caught 5 others in another spot on my property (still at least one left there too). I have a lot of lilies, so the damage is currently just opening some areas up. Not as happy about a few bald cypress he felled, but he seems to prefer other species of trees. Really took a toll on my few cork-screw willows. Need to figure out how to seal up the bottom of my trash rack where he removed bricks to get in... Needs to quit raining first.