According to Andrew Opie of the British Retail Consortium, UK meat producers already show on the pack where an animal was born and reared.

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We're in a burned-out area of Yellowstone National Park, miles from any road, surrounded by hundreds of acres of fire-blackened lodgepole pines, the hooves of our 17-animal pack train kicking up dust.

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It's horrific to see an animal so desperate to keep up with the pack, struggling to get up on three legs with that one snapped leg just swinging round and round.

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Beneath the waters swam the dreaded red-bellied piranha, the pack-hunting fish whose jagged teeth can strip the flesh from an animal in minutes.

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No other stallion has come close to that, say experts in cutting, a sport wherein a rider and horse "cut" a single animal from a cattle herd, then try to keep it from rejoining the pack.

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