Yoko, a chimpanzee (Pan Troglodytes), reacts after receiving a Christmas hamper, at Rio de Janeiro's zoo on December 18, 2012. AFP PHOTO /VANDERLEI ALMEIDA

Skiers are seen on a cable car above the fog on December 1, 2012 in the Titlis mountain above Engelberg, Central Switzerland. AFP PHOTO / FABRICE COFFRINI

A man carries a mannequin in the Belarus capital Minsk, on December 10, 2012. AFP PHOTO / VIKTOR DRACHEV

Swiss tennis player Roger Federer jokes to hide from a serve of French Jo-Wilfried Tsonga as he asks a ballboy to play for him during an exhibition match held at the Ibirapuera Gymnasium in Sao Paulo, Brazil, on December 8, 2012. AFP PHOTO/Yasuyoshi CHIBA

Swiss Shepherd dog, Talli, feeds orphaned tiger cubs and her own cubs in the Russian Black Sea resort of Sochi, on December 4, 2012. The little tigers, two male cubs, named Olymp and Dar and one female cub Talli, named after the adoptive mother, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. AFP PHOTO / MIKHAIL MORDASOV AFP PHOTO / MIKHAIL MORDASOV

This undated handout photo received on December 7, 2012 from Auckland-based advertising agency DraftFCB shows "Monty" in the driver's seat behind the wheel while training. Rather than chasing cars, dogs in New Zealand are being taught to drive them -- steering, pedals and all -- in a heartwarming project aimed at increasing pet adoptions from animal shelters. Animal trainer Mark Vette has spent two months training three cross-breed rescue dogs from the Auckland SPCA to drive a modified Mini as a way of proving that even unwanted canines can be taught to perform complex tasks. AFP PHOTO / DraftFCB ---- EDITORS NOTE---- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / DraftFCB" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

A picture taken on December 11, 2012 in Paris shows a watch on a person's wrist reading the time "12:12" and the date "12-12-12" for December 12, 2012, in front of a digital clock reading "December 12, 2012". With a rush to buy lucky lottery tickets and prayers for peace and harmony, people worldwide will mark once-per-century 12/12/12 lineup with humor, hope and a hint of mischief. AFP PHOTO THOMAS COEX

A dancer preforms with sand during Gideon Oberson's show at the Tel Aviv fashion week in the Mediterranean coastal city of Tel Aviv, on December 17, 2012. AFP PHOTO / JACK GUEZ

A lion holds a "Christmas gift" during a photocall marking Christmas at the London Zoo in central London on December 12, 2012. AFP PHOTO/CARL COURT

Lance, an Aldabra Tortoise eats water melon at Taronga Zoo in Sydney on December 14, 2012. In the lead up to Christmas a selection of the zoo animals were challenged with Christmas-themed environmental enrichment activities. AFP PHOTO / Greg WOOD

A mock UFO with alien dolls and reading "Smile, you are being abducted" is seen in Alto Paraiso town, Goias State, 230 kms north of Brasilia, on December 20, 2012. Situated over a huge quartz crystal plate, Alto Paraiso attracted many Brazilians and foreigners seeking refuge from the events expected by the Mayan prophecy that predicts the end of the world or the beginning of a new era. AFP PHOTO / Evaristo SA

An Iraqi federal policeman performs a skill during a graduation ceremony at a federal police training academy in Baghdad, on November 27, 2012. According to a police source, some 789 policemen graduated from a training course which took 60 days to complete. AFP PHOTO / AHMAD AL-RUBAYE

The mascot of the 8th edition of the African Military Cup (CAMFOOT) stands on the pitch before the final football match between Cameroon and Mali at the Felix Houphouet Boigny staduim in Abidjan on December 16, 2012. Mali won 1-0. AFP PHOTO/ SIA KAMBOU

Ryan Lochte of US shoes are pictured during the Short Course Swimming World Championships in Istanbul on December 16, 2012. AFP PHOTO/MIRA

A member of the Fire Dance Group performs a choreography with torches in the streets of Vilnius, Lithuania on November 03, 2012. AFP PHOTO / PETRAS MALUKAS

Egypt's Yassmin Attia (L) celebrates with her coach after beating Malaysia's Nisha Alagasan to take bronze medal in the Female Kumite under 55Kg category of the world karate championships on November 24, 2012 in Paris. AFP PHOTO/JACQUES DEMARTHON

A work entitled "Forehead" by British visual artists Jake and Dinos Chapman is displayed during an exhibition at the Royal College of Art in London on November 15, 2012. AFP PHOTO / JUSTIN TALLIS

A Colombian Air Force at the Catam Military Airport during the celebration of 93rd anniversary of the Colombian Air Force, in Bogota on November 9, 2012. AFP PHOTO/Luis Acosta

China's People Liberation Army (PLA) parachutists perform during the 9th China International Aviation and Aerospace Exhibition in Zhuhai on November 13, 2012. China's air show comes as the Communist Party holds a meeting to select the country's new leaders -- including the party's Central Military Commission, which controls the armed forces. AFP PHOTO / Philippe Lopez

A man shows his tattoo during the Tattoo Exhibition in Asuncion on November 17, 2012. AFP PHOTO/ Norberto Duarte

A woman dressed as a zombie participates in the first edition of a "Zombie Walk" event on November 3, 2012, in Yverdon-les-Bains, Switzerland. Wearing gruesome costumes and make-up, participants groaned through the city's downtown area. AFP PHOTO / FABRICE COFFRINI

Colombian Elena Mejia competes in the Miss Pole Dance Colombia 2012 competition in Medellin, Antioquia department, Colombia on September 26, 2012. AFP PHOTO/Raul ARBOLEDA

Employees of the botanic garden pose for a photo with a 5 year old boy who sits on a big lily pad in Stuttgart, southern Germany. Temperatures during the next few days are predicted to remain high, there may be occasional thunderstorms on the weekend. AFP PHOTO / MARIJAN MURAT GERMANY OUT

An artist scores a basket during a show held prior the women's preliminary round group A basketball match of the London 2012 Olympic Games Angola vs. Croatia on August 3, 2012 at the basketball arena in London. AFP PHOTO / TIMOTHY A. CLARY

A stuntman pretends to play the piano in the air as he and his cardboard instrument are lifted by a hot air balloon over Vilnius on August 10, 2012 during the Piano.lt summer festival. Vilnius remains one of the few European capitals allowing hot air balloons to fly over the city. AFP PHOTO / PETRAS MALUKAS