Read the following context and answer the question.
Context: When the time comes to move the fencing , or the pigs , they wo n't want to cross the line where they ' ve learned the ping exists . If you use wide ribbon electric fencing they can see it clearly and associate the ping with the ribbon rather than the area , so will readily move across the line once the fencing is removed . We find they might still need a little encouragement . As you can see these piglets who ran the first few days are now well on the way to relaxing in their new home .
Question: Why might the pigs be scared of moving through the area .
Answer:


They have been shocked going there previously .