4. Some wildlife corridors are naturally occurring, some need to be created
Sometimes, wildlife corridors were already present and all we need to do is protect them. For example, sometimes a narrow valley between mountains will act as a natural funnel and help bring species from one area to another. But sometimes, there are no natural corridors, and nature needs our help. That’s where conservation NGOs like the National Wildlife Federation, the Nature Conservancy, and others, come into play.
Wikipedia lists a few artificial wildlife corridors:
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