Bad Bears

From Edward Tenner's Our Own Devices: The Past and Future of Body Technology (Knopf, 2003) -

Bears cooperate to defeat other human technology; sow bears appear to send cubs into branches to dislodge carefully cached food, and young bears learn from observation how to break open automobile doors and penetrate the flimsy barrier separating the backseat from the food the owners thought they were protecting in the trunk. According to park rangers, who call the practice clouting, bears recognise specific brands and models, for example Honda and Toyota sedans, that are most vulnerable to attack, and use similar techniques on each model. When a particular model and color yield a rich cache of food, bears begin to attack similar vehicles every night. Mother bears show cubs how to pry open rear side doors by bending the door frame with their claws until it becomes a platform for reaching the backseat and trunk partition. Bears also brace themselves against neighbouring cars to break the windows of vans more readily.