But what are these wolves and sheep doing?

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"The Diamond District was a bunch of wolves and he was a sheep, " Isaac said.

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'This is about taking a world of predators, a world full of wolves, and creating more sheep, ' said Terry Maketa, the sheriff of El Paso County.

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"I'm getting a call from a rancher, yelling at me because the wolves are out and the killed some sheep, " Bangs says.

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Farmers get compensation when their sheep are killed and conservationists say only 300 are taken by wolves each year - out of a total flock of around 800, 000.

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What I mean by that is you want to make sure that when you are running, it is the wolves who are running beside you and not the sheep.

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The Campaign for Europe's Carnivores will benefit projects such as the Carpathian Large Carnivore project in Romania, home to dense populations of wolves, bears and Eurasian lynxes that live in close proximity to large numbers of people and sheep.

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With the controversial reintroduction of grey wolves to Yellowstone in 1995, the ecosystem here is complete again, with every predator, from wolves to grizzly bears, and every prey species, such as elk, moose, bighorn sheep and bison, that belongs here.

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