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Photo Gallery: Winter Wildlife

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Of the three remaining species of tigers, Siberian tigers are the largest. While there are only 400 to 500 left in the wild, the population is considered stable, and conservation programs are introducing captive-born tigers to the wild. National Geographic is working to avert the big cats' extinction with the Big Cats Initiative, a comprehensive program that supports innovative projects with quick results for saving big cats, anti-poaching programs, projects that test new technology and more. Photograph by Michael Nichols