Penguins dressed in Santa costumes and Christmas tree costumes are paraded at Everland, South Korea's largest amusement park on December 18, 2013 in Yongin, South Korea. Many Christian and non-Christian Koreans celebrate the holiday by exchanging gifts, caroling and participating in church services. South Korea is the only east Asian nation that recognises Christmas as a national holiday. (Photo by Chung Sung-Jun/Getty Images)

Visitors take photographs of penguins wearing Santa Claus (in red) and Christmas tree (in green) costumes during a promotional event for Christmas at an amusement park in Yongin, south of Seoul, December 18, 2013. (Photo by Kim Hong-Ji/Reuters)

A boy on a stroller looks at penguins wearing Santa Claus (in red) and Christmas tree (in green) costumes during a promotional event for Christmas at an amusement park in Yongin, south of Seoul, December 18, 2013. (Photo by Kim Hong-Ji/Reuters)

Visitors look at penguins wearing Santa Claus (in red) and Christmas tree (in green) costumes during a promotional event for Christmas at an amusement park in Yongin, south of Seoul, December 18, 2013. (Photo by Kim Hong-Ji/Reuters)

Penguins dressed in zookeeper (front) and Christmas costumes (behind) are paraded at an amusement park for a promotional event in Yongin, south of Seoul, on December 18, 2013. Everland, South Korea's largest amusement park, organized the event to launch its Christmas festival season. (Photo by Woohae Cho/AFP Photo)

Penguins dressed in costumes are paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. Everland, South Korea's largest amusement park, organized the event to launch its Christmas festival season. (Photo by Woohae Cho/AFP Photo)

Penguins dressed in costumes are paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

A penguin dressed in a Santa Claus costume is followed by others as they are paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

Penguins dressed in costumes are paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

Trainers dressed Santa Claus costumes take care of a penguin (R) and a fennec fox (L) dressed in costumes for a promotional event at an amusement park ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

A penguin dressed in a Santa Claus costume is paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

A penguin dressed in a zookeeper costume is paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

Trainers dress penguins in various Christmas costumes before they are paraded at an amusement park for a promotional event in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

A visitor takes a photo of penguins (bottom R) dressed in costumes as they are paraded at an amusement park for a promotional event ahead of Christmas in Yongin, south of Seoul, on December 18, 2013. (Photo by Woohae Cho/AFP Photo)

A penguin dressed in a Santa costume is paraded at Everland, South Korea's largest amusement park on December 18, 2013 in Yongin, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Penguins, dressed in Santa Claus and Christmas tree costumes, parade through spectators during a Christmas event at the Everland amusement park in Yongin, South Korea, Wednesday, December 18, 2013. Christmas is one of the biggest holidays in South Korea as over half the population are Christians. (Photo by Ahn Young-joon/AP Photo)

Penguins dressed in Santa costumes are paraded at Everland, South Korea's largest amusement park on December 18, 2013 in Yongin, South Korea. (Photo by Chung Sung-Jun/Getty Images)

A helper dressed as Santa Claus holds a Fennec fox at Everland, South Korea's largest amusement park on December 18, 2013 in Yongin, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Penguins dressed in Santa and Christmas tree costumes are paraded at Everland, South Korea's largest amusement park on December 18, 2013 in Yongin, South Korea. (Photo by Chung Sung-Jun/Getty Images)