Saw this posted at a hatchery a couple days ago. Woodland Park Zoo is apparently sponsoring a State-wide study on River Otters that has, "... a special focus on river otters as sentinels of ecosystem health along the Green-Duwamish River." I wonder if it occurred to the authors of the study to ask WDFW for trapper catch data? Anyway, if trappers reported I bet the people conducting the study would be shocked at how many otters are out there.