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[–] Spaceballs-1 0 points 1 points (+1|-0) ago 

This was done as well in British Columbia for where the deer and elk crossed a major highway. Large fences were placed on each side of the roadway to herd the animals through the tunnels.

It didn't take long for the carnivores to figure it out.

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[–] bman0321 0 points 1 points (+1|-0) ago 

I was thinking that these little penguin sewers would fill with water and if the costs were reasonable then there should be more, that they can swim so who cares. But after what you said, this is just a fatal funnel for these fairies.