Melissa Stewart's team competes in the official restart of the Iditarod, a nearly 1,000 mile (1,610 km) sled dog race across the Alaskan wilderness, in Fairbanks, Alaska, U.S. March 6, 2017. (Photo by Nathaniel Wilder/Reuters)

Ahmed, a 10-year-old jockey, looks on during the opening of the International Camel Racing festival at the Sarabium desert in Ismailia, Egypt, March 21, 2017. (Photo by Amr Abdallah Dalsh/Reuters)

Participants arrive at the finish line during the annual Maldon Mud Race in Maldon, east England on May 7, 2017. Originating in 1973, the race involves competitors racing around a course through the River Blackwater in Essex at low tide. (Photo by Daniel Leal-Olivas/AFP Photo)

A woman pours alcohol from the bottle into her mouth at the Far Hills Race Day at Moorland Farms in Far Hills, New Jersey, October 17, 2015. Young locals in New Jersey catch up with friends from school and college days at the Far Hills Race Day, which started as a fox-hunting event in the early 1900s. Many racegoers first went to the Hunt, as it's known locally, as children, but nowadays it's an alcohol-fuelled party for them. Makeshift bars are set up in cars, with the horses' efforts on the turf sometimes a backdrop to the main event. (Photo by Stephanie Keith/Reuters)

A Thai jockey competes during an annual water buffalo race in Chonburi Province, south of Bangkok, Thailand, Monday, October 26, 2015. The annual race is a celebration among rice farmers before harvest. (Photo by Sakchai Lalit/AP Photo)

Hollowed pumpkins float on a lake Ludwigsburg Castle on September 19, 2010 in Ludwigsburg, Germany. (Photo by Ralph Orlowski/Getty Images)

Participants sit on a cable chair as they take part in the 30th edition of the Belalp Witches Ski Race on January 14, 2012 in Belalp, Switzerland. The race is inspired by a legend dating back to the middle ages, of a witch who tormented villagers in the area until she was burnt to death. (Photo by Harold Cunningham/Getty Images)

People attend the Stranavigli Water Race held at the Naviglio Grande on July 16, 2011 in Milan, Italy. Stranavigli Water Race is an annual creative contest on the water. (Photo by Vittorio Zunino Celotto/Getty Images)