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Vetstreet: 20 Animals You Might Not Know Are Going Extinct

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Despite their massive curling horns, Bighorn sheep aren't safe from extinction. One of the three sheep subspecies, the Sierra Nevada Bighorn sheep, is currently listed as endangered. In the early 1900s, as many as 2 million Bighorn sheep could be found in California and other regions of the U.S. Now fewer than 70,000 live in those areas.

(Credit: Thinkstock)

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