Skiers attached to 78-stone horses as they thunder down a snowy race track compete in a bizarre sport known as skijoring. Horses and riders are specially trained to pull the skiers who are attached to the animals by a tow rope.

The skijorers tackle jumps and obstacles as they race down a street in Helena, Montana, US, all vying for a place in the national finals competition. Freelance photographer Donnie Sexton took photos of the unusual sport as competitors raced to the finish...
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