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========== Why did the chicken cross the road? We may
never know, since she probably never got to the other side. In the US alone, about a million
animals are flattened by passing motorists each day – and that doesn’t count all
the bugs! Animals are constantly confronted with barriers,
some of them completely natural, and others that we build that are barely barriers at
all. As we build our own infrastructure, we’re also adding to this obstacle course without
meaning to, and these unintentional fences are some of the most effective animal barriers
out there. Roads are just the beginning. Take high-tension power lines, for example.
They may look harmless to us, but many other creatures steer clear. We can’t say why
for sure, but these animals’ ultraviole...