Mom dressed as Santa and a boy dressed as Santa's helper posing under the water in the pool on December 15, 2016 in Odessa, Ukraine. (Photo by Andrey Nekrasov/Barcroft Images)
Santi Diaz Mosquera, 41, a “percebeiro” (barnacle fisherman), collects barnacles on rocks on the coast of Ferrol, in the northwestern Spanish region of Galicia, December 15, 2016. (Photo by Nacho Doce/Reuters)
Enthusiasts gathered at Cad East in Snowdonia National Park, England to take pictures of F-15 Eagle fighters as they completed the Mach Loop, November 2017. (Photo by Caters News Agency)
Two race pigs jump over an obstacle during a rural festivity in reference to Maria Ascension in San Bernardino, Switzerland on Monday, August 15 2016. (Photo by Samuel Golay/Keystone/TI-Press via AP Photo)
A Thai veterinarian sterilizes a monkey in a bid to control the birth rate of the monkey population in Hua Hin city, Prachuap Khiri Khan Province, Thailand, 15 July 2017. (Photo by Narong Sangnak/EPA/EFE)
A model slips on the runway while parading an outfit by Australian designer Toni Maticevski at Fashion Week Australia in Sydney on May 15, 2016. (Photo by William West/AFP Photo)
A girl marches alongside Salvadoran soldiers during the parade commemorating Independence Day in San Salvador, El Salvador September 15, 2016. (Photo by Jose Cabezas/Reuters)
DAYTONA BEACH, FL - NOVEMBER 15: Dale Earhhardt Jr., driver of the #88 National Guard/Diet Mountain Dew Chevrolet races with Joey Logano, driver of the #20 Home Depot Toyota during the NASCAR Aerodynamic and Fuel Injection Test at Daytona International Speedway on November 15, 2011 in Daytona Beach, Florida. (Photo by Jerry Markland/Getty Images for NASCAR)