That's One Clever Wolf

A scheme to control the invasive European Green Crab in British Columbia was knocked for a loop when many of the traps were found to have been dragged back to shore. Cameras set up to catch the culprit found it was a wolf. The wolf knew what was in the trap situated out in the water, and took deliberate and obviously practiced steps to retrieve the buoy, then use it to drag the trap to shore. Then the wolf disabled the trap and helped herself to the bait inside.  

Is this an example of tool use? It is the first such intricately planned behavior observed in a wild wolf, but psychologists are arguing over whether the wolf was using tools to achieve a goal. That comes down to the definition of "tool use." But however you look at it, this is a clever wolf. Did she figure this out on her own, or are there many wolves that pass this technique to each other? While complicated, it's easier than catching a free swimming fish.