In this May 29, 2017 photo, a Rocky Mountain bighorn sheep ewe and her 16-hour-old lamb move around an escarpment in the Cheyenne Buttes near Fort Robinson State Park, Neb. Eighteen times in recent weeks, a team of wildlife biologists dashed into the hills and canyons of northwest Nebraska in a race-the-clock campaign to capture newborn Rocky Mountain bighorn sheep to help the species survive an ongoing pneumonia scourge. (David Hendee/The World-Herald via AP)
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