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Vetstreet: 20 Animals You Might Not Know Are Going Extinct

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Wolves, the largest cousin of the canine family, are a very important part of the cycle of life. North America's Gray wolves are what biologists call "keystone predators," meaning they are an essential element in their ecosystem. Gray wolves are hearty and highly adaptable, but due to poaching and habitat loss across America, their numbers have fallen alarmingly low.

(Credit: Thinkstock)

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