Photo: Dog Virus May Be Killing Yellowstone Wolves



A male gray wolf pup prepares for reintroduction into Yellowstone National Park in 1995. Yellowstone's pups have been dying of what experts suspect is parvovirus, a disease that afflicts young dogs.

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NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

National Geographic Traveler has scoured the globe for the world's most beautiful, interesting, and off-beat road trips. Dive in to get drive directions, quizzes, photos, and more.