This July 2015 photo provided by the Wisconsin Department of Natural Resources shows a pair of North American river otters along a Lake Superior tributary in northern Wisconsin. North Dakota's Game and Fish Department this summer will propose an otter trapping season. If Gov. Doug Burgum approves, North Dakota will become the 34th state to allow the killing of otters. Preservation groups worry the expansion of otter trapping in the U.S. and Canada in recent decades isn't sustainable. (Nathan Roberts/Wisconsin Department of Natural Resources via AP)
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