In this May 30, 2017 photo, Todd Nordeen, from left, Erin Wood and Dane Horowski search for Rocky Mountain bighorn sheep lambs 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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