The Madrean Sky Islands are a cluster of more than 60 high-elevation mountains rising out of lowland valleys running from southern Arizona and New Mexico into Mexico. Home to 7,000 species, many endangered, researchers call it one of the most biodiverse areas in North America. If President Donald Trump's long-touted campaign promise of a "big, beautiful" border wall were to come to fruition the existence of some of the zone's rarest species — jaguars, ocelots, Mexican gray wolves — would be jeopardized. Researchers say they don't quite know the extent of the damage that could occur, but researchers at the Sky Island Alliance are working to find out by tracking species with motion sensor cameras along the border.


Megan Janetsky/Arizona Center for Investigative Reporting 

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