Species gain this "lost" status when there hasn't been a trace of them in 10 years, according to the International Union for the Conservation of Nature.
In two very different stories about one of America's fastest-growing sports, we head to a 24-hour mountain bike relay race. Then we talk to some of the people behind a documentary about spreading mountain biking on the Navajo Nation.
Also on Arizona Spotlight: The International Uranium Film Festival returns to Tucson; the comedy of Elliot Glicksman; and "Stories That Soar!" looks at how children cope with depression.
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