Huskies train in the forests near Feshiebridge, Scotland, for the 30th Siberian Husky Club Aviemore Sled Dog Rally at Loch Morlich near Aviemore, Scotland, on January 23, 2013. Every year since 1984, mushers from across the UK have gathered in the forests around Aviemore for the biggest event in the British sled dog racing calendar. (Photo by Andrew Milligan/PA)

A circus artist performs with dogs during the opening show of the 2013 season in Ukraine's National Circus in Kiev, on January 24, 2013. (Photo by Efrem Lukatsky/Associated Press)

Haui-San, front, a clouded leopard cub, plays with his leash as his brother, Niki-San, looks off in the distance during a garden walk at the San Diego Zoo in California on January 16, 2013. The cubs, both about 5 months old, are undergoing training before they begin interacting with the public. (Photo by Gregory Bull/AP)

An 11-year-old female chihuahua named “Grizett” wears a fashion item during an event in Tokyo, January 23, 2013. (Photo by Itsuo Inouye/Associated Press)

A tiger yawns before rolling in the snow at the Buffalo Zoo during the cold winter weather in Buffalo, N.Y., Tuesday, January 22, 2013. After relatively mild conditions for the first part of winter, more typical weather settled across upstate New York on Tuesday, (Photo by David Duprey/AP Photo)

A man swims through icy waters of the Dnipro river in Kiev, Ukraine, January 23, 2013. (Photo by Sergei Chuzavkov/Associated Press)

A man photographs a statue titled “Pentateuque” by French artist Fabien Merelle at the Art Stage Singapore 2013 exhibition and trade show, on January 23, 2013. (Photo by Wong Maye-E/Associated Press)

In this photo taken Thursday January 17, 2013, sled dogs Poncho, left, and his blind brother Gonzo are hooked up for a run at the Muddy Paw Sled Dog Kennel, in Jefferson, N.H. Poncho has taken to helping his blind brother on regular runs. (Photo by Jim Cole/AP Photo)

Xiao Liwu, a 5 1/2-month-old male panda, looks on from his enclosure at the San Diego Zoo Wednesday, January 16, 2013, in San Diego. The panda cub now is on display for short periods at the Zoo, after passing recent health examinations. (Photo by Gregory Bull/AP Photo)

A meerkat at the London Zoo gets a close look at a snowman on January 21, 2013. (Photo by Zsl London Zoo/EPA)

People look at a 18 meter long deceased whale which was discovered on the beach early this morning in Les Sables d'Olonne, western France, January 25, 2013. (Photo by Stephane Mahe/Reuters)

A one-week old female South American tapir (L) with her mother Sabrina in their enclosure in Wroclaw Zoo in Wroclaw, Poland, 18 January 2013. (Photo by Maciej Kulczynski/EPA)