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Time for ‘bear crossing’ signs?

I was driving home a few days ago when an adult black bear dashed across the road. It passed in front of a car just ahead of mine. Instead of vaulting over the guardrail when it reached the other side, the bear squeezed under it. I was impressed. 

There is not much space between the uprights of that barrier. My wife has seen a bear hopscotch over a guardrail. It made me think about how these large mammals navigate this landscape, and what they consider when they are forced to break cover and cross the road.

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