A person costumed as Krampus or Percht, figures from ancient Austrian custom, performs during a Perchten run in Vienna, Austria, December 2, 2018.

Children hold masks with a face of fictional character Greg Heffley, during the visit of American cartoonist Jeff Kinney in Oslo, Norway, November 29, 2018.

Zhong Xiaojie, 19, wrestles a bull to the ground during a bullfight in Jiaxing, Zhejiang province, China October 27, 2018.

A Christmas tree made of plastic chairs is pictured at the Macroplaza in Monterrey, Mexico November 26, 2018.

Songbirds caught by Palestinian Hamza Abu Shalhoub, 16, are seen in a cage at the site of Gaza destroyed airport, in Rafah in the southern Gaza Strip November 8, 2018.

An artist works on a sand sculpture representing part of nativity scene in St. Peter's square at the Vatican, December 6, 2018.

Furhat, the social robot with a back-projected face that can change its personality and talk to people, is shown at a demonstration of the technology in London, Britain November 19, 2018.

Britain's Camilla, the Duchess of Cornwall, Patron, visits ICAP during the broker's 26th annual Charity Day, in London, Britain, December 5, 2018.

Model Adesuwa Aighewi takes a selfie as she is interviewed by Sophia, a humanoid robot created by Hanson Robotics, backstage before the "Alexander Wang Collection 2" presentation in Brooklyn, New York City, U.S., December 1, 2018.

Competitors wait at the start line of the Liverpool Santa Dash in Liverpool, Britain, December 2, 2018.

A staff member poses for a photograph next to the Museum of Architecture's Gingerbread City at the V&A Museum, in London, Britain, December 5, 2018.

Salvadorean clowns pose for a group picture during Salvadoran Clown Day celebrations in Santa Tecla, El Salvador, December 5, 2018.

A diver dressed as Santa Claus swims inside a fish tank at the Tropicarium aquarium in Budapest, Hungary, December 6, 2018.

A man wearing a storm trooper costume stands in front of Star Wars posters belonging to costume designer John Mollo, during a photo-call ahead of an auction at Bonhams in central London, Britain December 6, 2018.

A woman walks amidst trees covered with hoarfrost and snow in a forest on the bank of the Yenisei River, with the air temperature at about minus 32 degrees Celsius (minus 25.6 degrees Fahrenheit), near the Siberian city of Krasnoyarsk, Russia December 6, 2018.