Communists controlled Czechoslovakia during the Cold War and they constructed three electrified fences on the West Germany border. These fences were heavily guarded and dangerous so no one could pass. In fact, 500 people almost died trying. During this time, local red deer developed a pattern to not cross the border which they continue to do even today. Now the fences are long gone but the deer refuse to venture past their Czech or German sides.
This is fascinating!
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