A red squirrel (Sciurus vulgaris) holds a nut in its mouth in a garden in Hanover, Germany, 25 September 2013. (Photo by Julian Stratenschulte/AP Images/DPA)

Wevellyn Antunes Rocha, from left to right, Maria Deusaunira Borges, Uyara Borges, Nayara Borges, Daniella Klipe, Gisele Candido, and Ary Borges gather at the breakfast table with tiger Tom, in Maringa, Brazi, on September 27, 2013. Ary Borges, who cares for Tom, eight other tigers and two lionesses, is in a legal battle with federal wildlife officials to keep his endangered animals from undergoing vasectomies and being taken away from him. (Photo by Renata Brito/Associated Press)

Ary Borges feeds his tiger named Dan at his home in Maringa, Brazil, Thursday, September 26, 2013. Borges is in a legal battle with federal wildlife officials to keep his endangered animals from undergoing vasectomies and being taken away from him. He defends his right to breed the animals and says he gives them a better home than they might find elsewhere in Brazil. (Photo by Renata Brito/AP Photo)

Meerkats inspect a pumpkin carved in Halloween design and filled with flour worms and straw at the Zoo in Leipzig, eastern Germany, on September 25, 2013. Suited to the upcoming Halloween holiday, the animals’ enclosure is decorated with pumpkins and delights meerkats and visitors. (Photo by Waltraud Grubitzsch/AFP Photo/DPA)

A stag roars in its enclosure at Wildpark Eekholt in Grossenaspe on September 27, 2013 as the mating season for deer has begun. (Photo by Axel Heimken/AFP Photo/DPA)

Reno Rosser releases one of the 52 Texas longhorn steers which were lead across the Tower Bridge toward the Capitol on Monday, September 23, 2013 in Sacramento, Calif as one of dozens of events set for “Farm-to-Fork Week”, which runs through September 29. (Photo by Randy Pench/AP Photo/The Sacramento Bee)

This undated handout photograph released by the Taipei City Zoo on September 26, 2013 shows giant panda Yuan Yuan holding her baby panda, Yuan Zai, at the Taipei City Zoo. The cub, the first panda born in Taiwan, was delivered on July 7 following a series of artificial insemination sessions after her parents – Yuan Yuan and her partner Tuan Tuan – failed to conceive naturally. (Photo by AFP Photo/Taipei City Zoo)

This September 26, 2013, photo shows a baby black-and-white colobus monkey with its mother Kianga at the Santa Ana Zoo at Prentice Park in Santa Ana, Calif. The monkey was born September 1 and is currently teething. (Photo by Bruce Chambers/AP Photo/The Orange County Register)

A dolphin springs from the water in front of unsuspecting surfer, Trent Sherborne, on September 26, 2013. (Photo by Caters News)

A grevy zebra looks on in its pen at the zoo of Mulhouse, eastern France, on September 23, 2013. (Photo by Sebastien Bozon/Agence France-Presse)

An incredible shot of a buffalo leaping over two metresin the air to try and escape a lion's grasp, on September 26, 2013. (Photo by Jacques Matthysen/Caters News/The Grosby Group)

A six month-old baby Orangutan is seen in a nursery room at the Taman Safari zoo of Cisarua, West Java, Indonesia, on September 24, 2013. (Photo by Caters News)

A tiny water vole pulls off a berry from a plant for his dinner, on September 23, 2013. (Photo by Caters News)

An incredible shot of a Great White shark leaping from the ocean to catch a seal at Seal Island, False Bay, South Africa, on September 23, 2013. (Photo by Caters News)

Dublin Zoo is delighted to announce the addition of two male okapis to the Dublin Zoo family. Kamba aged 14 and Kitabu aged 6, arrived from Rotterdam Zoo this month and are the first okapis in Ireland. (Photo by Patrick Bolger)

Lion cubs play in Szorako Zoo in Gyongyos, 79 kms northeast of Budapest, Hungary, on September 25, 2013. The four still unnamed cubs were born on August 29. (Photo by Peter Komka/AP Photo/MTI)

Lesser White-fronted Geese prepare to land next to French pilot and migratory bird protector Christian Moulec on an ultralight flight during the 40th Icare Cup paragliding festival in Saint Hilaire du Touvet, in the French Alps, on September 21, 2013. The “Coupe Icare”, dedicated to free flight, orchestrates all the various types of flying such as hang gliding, paragliding and acrobatic sailplaning. (Francois Mori/Associated Press)

A gibbon named Lele looks out of a window on a bus which travels to the Yunnan Wildlife Park in Kunming, on September 25, 2013. The new bus line to the park began its trial run accompanied by some animal stars from the park as a promotional campaign (Photo by China Daily)

The huge bull elephant is not phased by the river blocking its path. Just its giant white tusks and trunk can be seen as it paddles for ten minutes under the slow-flowing river. Nature photographer Vincent Grafhorst travelled to the Chobe River, Botswana, to capture the special moment. (Photo by Vincent Grafhorst/Solent News & Photo Agency)

Eight-year-old female dog Pulguinha sleeps with the Brazilian football team jersey on a bench in Rio de Janeiro, on September 28, 2013. (Photo by Yoshi Chiba/AFP Photo)

This amazing picture captures the moment two frogs work together to get up a tree, on September 27, 2013. (Photo by Caters News)

The real hairy bikers: Handoko ride his scooter with his dogs Ace and Armani in East Java, Indonesia, on September 27, 2013. (Photo by Caters News)

A coati jumps through burning hoops during a show called the Caravan of Wonders at the National Circus in Kiev, on September 21, 2013. (Photo by Sergei Supinsky/AFP Photo)

A tiger cub named Santana peers out from its box at a Zoo in Mulhouse, France on September 23, 2013. (Photo by Sebastien Bozon/AFP Photo)

A boy plays with a goat in front of closed shops in an alley in the old quarters of Delhi, India, on September 22, 2013. (Photo by Mansi Thapliyal/Reuters)

A dog looks out of a public swimming pool in Bamberg, southern Germany on September 21, 2013. The public swimmingpool opened exclusively for animals for a day. (Photo by David Ebner/AFP Photo/DPA)

A very young Sitatunga (Tragelaphus spekii) raging from the first time in his enclosure at the Berlin Zoo, on September 25, 2013. (Photo by Bernd Von Jutrczenka/AFP Photo/DPA)