I have a 1.3 acre farm pond which we dug and stocked with fish 4 years ago. 2 weeks ago the dogs found and partially dug up what appeared to be a tunnel at water level. (5" diameter) I thought of muskrat, but my livetrapping efforts have produced nothing. This morning I found a rescently killed 4 lb bass 3 feet from shore. It had bite marks on its back, but was not eaten at all. Could this be an Otter? If yes, I would like it to be somewhere else. Can anyone help? Thanks