Zookeepers measure the length of a pueblan milk snake in the Reptile House of ZSL London Zoo as part of their annual weighing and measuring of their animals on August 25, 2011 in London, England. The heights and weights of over 750 different animal species at the zoo are recorded into the International Species Information System, to monitor their health and share the data with other zoos across the world. (Photo by Oli Scarff/Getty Images)

Hardy Dutch swimmers brave the icy North Sea on January 1, 2012 in Scheveningen, Netherlands. A record number of 10,000 people took the plunge in this year's traditional New Year's dip. The high turnout was attributed to the mild weather with a sea temperature of 8 degrees compared to 4 degrees last year. (Photo by Jasper Juinen/Getty Images)

Duncan Fenton from the Society of William Wallace stands next to a 700-year-old letter believed to have been in the possession of William Wallace, which has returned to National Records of Scotland on January 12, 2012 in Edinburgh, Scotland. (Photo by Jeff J. Mitchell/Getty Images)

Katie Francis, a member of the Difficult Access Team from Wiss, Janney, Elstner Associates, inspects a gargoyle while rapelling down one of the north tower on the west front of the National Cathedral while looking for damage from August's magnitude 5.8 earthquake and high winds from Hurricane Irene October 17, 2011 in Washington, DC. DAT members used cameras, cell phones and iPad computers to record places on the cathedral's west front where damage was apparent. (Photo by Chip Somodevilla/Getty Images)

Giant panda Jia Jia enjoys her birthday cake made with ice and vegetables at Ocean Park in Hong Kong, Tuesday, July 28, 2015 as she celebrates her 37-year-old birthday. Jia Jia broke the Guinness World Records title for “Oldest Panda Living in Captivity” on Tuesday. (Photo by Kin Cheung/AP Photo)

Rungis is a commune in the southern suburbs of Paris, France. It is best known as the location of the large wholesale food market serving the Paris metropolitan area and beyond, the Marché d'Intérêt National de Rungis, said to be the largest food market in the world. The name Rungis was recorded for the first time in a royal charter of 1124 as Rungi Villa. Here: swordfish are sold at the fish pavilion in Rungis International food market as buyers prepare for the Christmas holiday season in Rungis, south of Paris, December 11, 2015. (Photo by Philippe Wojazer/Reuters)

People wearing and holding helmets take part in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. The drill was held in Ginza, a high-end shopping and business district, and held ahead of the 93rd anniversary of the Great Kanto Earthquake of 1923 which claimed at least 100,000 casualties. It was one of the largest natural disasters in recorded history and since 1960, September 1st, and the period around that date has been declared as national disaster prevention awareness period. (Photo by Kim Kyung-Hoon/Reuters)