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Trump's divided desert: Wildlife at the border wall

Trump's divided desert: Wildlife at the border wall

Science
Media playback is unsupported on your devicePresident Trump's promise to build a "great wall" along the US-Mexico border remains one of the central and most controversial promises of his presidency. But scientists from the University of Arizona are starting to unravel the effect that such a wall could have on a desert ecosystem it will cut through. The team is studying wildlife in the Sonoran Desert, which stretches across the border from Arizona into Mexico and is already divided by a barrier at the border. BBC science reporter Victoria Gill joined the team in a search for some of the desert's most endangered animals. Its proximity to the border gives Organ Pipe Cactus National Monument a dangerous reputation. But as you bump along dirt roads of this set-aside swathe of the Sonoran Desert...