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Botanists are scouring the US-Mexico border to document a forgotten ecosystem split by a giant wall

Tijuana-based field botanist Mariana Fernandez of Expediciones Botanicas leads a botanical expedition with college students to document native plants along the U.S.- Mexico border on Friday, April 19, 2024, in the Ejido Jacume in the Tecate Municipality of Baja California, Mexico. Flora and fauna that have gone extinct or are in danger of disappearing in the U.S. have been found to be thriving in remote spots south of the border, producing specimens that can then be used to bring back populations, scientists say. But the region's crime has deterred many U.S. scientists from crossing the border. (AP Photo/Damian Dovarganes)
Tijuana-based field botanist Mariana Fernandez of Expediciones Botanicas leads a botanical expedition with college students to document native plants along the U.S.- Mexico border on Friday, April 19, 2024, in the Ejido Jacume in the Tecate Municipality of Baja California, Mexico. Flora and fauna that have gone extinct or are in danger of disappearing in the U.S. have been found to be thriving in remote spots south of the border, producing specimens that can then be used to bring back populations, scientists say. But the region's crime has deterred many U.S. scientists from crossing the border. (AP Photo/Damian Dovarganes)

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