From Massive Science (massivesci.com):
Two wolves press their noses against a fence, scenting a tray of food on the other side. A rope dangles within their reach — a clue to the puzzle. If only one wolf pulls the rope, it comes loose and no one gets the food. But if they tug together, the snack will be theirs.
This might seem like a test of plain-old smarts. Put two good problem-solvers together, and they can figure it out. But according to a , the wolves’ bond with each other — rather than either individual’s intent or mental abilities — matters most.