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The fight against President Trump’s border wall gained urgency this week when the Department of Homeland Security announced plans to fast-track construction. Photos are a particularly effective reminder of just what is at stake, and yesterday the American Society of Mammalogists tweeted pictures of species that the wall threatens.

Scientific and environmental groups have been pushing back against President Trump’s border wall since his campaign, arguing that it could devastate the wildlife that live and migrate through the region.

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