A fox as many characteristics, camouflage, ability to adapt, cunning. Cunning in its true nature allows you to observe and keep silent. You camouflage yourself as you watch. And as you watch, you understand what will happen next, the many possibilities. As in all characteristics, they can be taken to the extreme, causing harm instead of good. Many cartoons have shown the fox as cunning and conniving.
Here are some great pictures displaying the cunning of a fox.
The cunning fox (ringed) sprang over five feet onto his bird table to snatch some scraps of bread