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    Racers wait in line to register for the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017. Racers equip their burro with a pack saddle weighing a minimum of 33 pounds that must include a pick, shovel, and gold pan.

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    A racer carries his pack saddle before competing in the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017.

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    Bill Lee, 68, of Idaho Springs, Colorado poses for a portrait before running in the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017. Lee has been racing for more than thirty years.

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    John Auburn of Ridgecrest, California and his burro Beethoven wait for the start of the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017.

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    A burro waits to run in the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017.

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    A racer and his burro wait for the start of the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017.

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    Racers and their burros run down Front Street at the start of the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017.

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    A burro makes its way past spectators during the 69th Annual Burro Days Pack Burro Race in Fairplay, Colorado on July 30, 2017.

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    Racers make their way up Mosquito Pass during the 69th Annual Burro Days Pack Burro Race in Fairplay, Colorado on July 30, 2017.

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    Ben Orvold of Sussex, Wisconsin pulls along his burro Bandit as they make their way up Mosquito Pass during the 69th Annual Burro Days Pack Burro Race in Fairplay, Colorado on July 30, 2017.

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    Kirt Courkamp of Pine, Colorado and his burro Mary Margaret run past the North London Mine after racing over Mosquito Pass during the 69th Annual Burro Days Pack Burro Race in Fairplay, Colorado on July 30, 2017.

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    Kirt Courkamp of Pine, Colorado bows his head in exhaustion after winning the Pack Burro Race during the 69th Annual Burro Days in Fairplay, Colorado on July 30, 2017. Courkamp and his burro Mary Margaret, finished the course in under six hours.

Burro Days