The trouble with border fences

How building border walls harm wildlife.

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Recent events and talk about a new border wall in the United States has raised concerns for wildlife. Below are links to a few articles on the subject. 

 The Environmental Impacts of a Border Fence   by Jeffrey P. Cohn

 Wall Could Have Unexpected Victims: Wildlife  By Laura Geggel, Senior Writer

 Wall Could Cause Serious Environmental Damage  By Erika Bolstad