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This rare Persian leopard was the 5,000th entry in Joel Sartore's Photo Ark.
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The last Syrian brown bear was spotted in its namesake country more than 50 years ago.
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Watch what happens when Joel follows his nose to the next Photo Ark species.
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Among widespread species decline, the Iberian lynx is a rare success story.
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While white-tailed deer are overabundant, the key deer subspecies's numbers are in decline
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This odd-looking creature was one of the first to board Joel Sartore's Photo Ark.
