A red panda rests on a branch on April 25, 2013 at the Zoo in Nuremberg, Germany. (Photo by Daniel Karmann/AFP Photo)

A bee collecting pollen in flowers of a cherry tree in Potsdam, Germany, on April 22, 2013. (Photo by Patrick Pleul/AFP Photo)

Red macaws flying in the park Xcaret in the Mayan Riviera, near the city of Playa del Carmen, Mexico, on April 25, 2013. This bird is endangered in Mexico not only for the destruction of their habitat, but because of the illegal trade of the macaw. It is estimated that in the wild, its population is no more than 400 macaws. The scarlet macaw is also found in the rainforests of Colombia, Venezuela, Brazil and other nations. In Mexico, the largest number of scarlet macaws in the country is located in Xcaret Park. With about 1,000 copies, Xcaret is home to the densest population of macaws in Mexico: 100 couples of reproductive age. In 2009, the reproduction program reached 113 births, of which 105 are still living. Due to these births, Xcaret was creditor to the Guinness World Record in 2011 for the highest number of macaws bred in one year. This year, the program closed with 175 macaw births. (Photo by Elizabeth Ruiz/AFP Photo)

People prepare to paddle on a boat in the flooded village of Tosno during a spring flood in the northwestern Russian Leningrad region, on April 22, 2013. (Photo by Olga Maltseva/AFP Photo)

A Palesitinian farmer feeds carnation to his sheep at the Hijazi flower farm in Rafah town, in the southern Gaza Strip, on April 25, 2013. Palestinian farmers fed their livestock part of this year's flower crop, a product grown almost exclusively for export to the European market, due to export restrictions, imposed by Israel after the Islamist Hamas party took control of the impoverished strip. (Photo by Said Khatib/AFP Photo)

A Crowned Crane grazes at a hotel compound in Nairobi, Kenya, on April 20, 2013. (Photo by Noor Khamis/Reuters)

A dog wrapped in a jacket, belonging to a street artist, sits on a pavement in London April 22, 2013. An influential academic paper which made the case for austerity, is thought to be flawed. The paper, called “Growth in a Time of Debt” by Harvard professors, Carmen Reinhart and Ken Rogoff, has data missing, according to Universtiy of Massachusetts student, Thomas Herndon. (Photo by Stefan Wermuth/Reuters)

A stray dog looks out of its enclosure at Dogtown, a protection, care and adoption centre for stray animals in Uzunu, 35 km (22 miles) south of Bucharest April 25, 2013. Around 400 stray dogs, mainly from Bucharest, are hosted now at Dogtown, waiting for adoption. According to its townhall, 65,000 stray dogs stay in Bucharest and the National Institute for Infectious Diseases reported that 16,000 people were bitten by dogs in 2012, an increase of 3,231 more cases than in 2011. (Photo by Bogdan Cristel/Reuters)

A breeder, whose business has been affected by the H7N9 bird flu virus, walks his ducks along a road in Changzhou county, Shandong province, on April 25, 2013. A dropoff in Chinese demand for soybeans used to feed poultry and livestock could last for months, as consumers lose their appetite for poultry in response to a deadly bird flu virus outbreak and amid lingering images of rotting pig carcasses floating in a river. (Photo by Reuters/Stringer)

Firefighters from San Diego, Califorina, USA, gave a demonstration of how to use an oxygen mask on animals. The test was done on the pig “Baby Banks” and labrador dog “Emma”. Masks are specially made to fit noses of various kinds of domestic animals. The institution received a donation of 60 of these devices an NGO that looks after the safety of the animals. (Photo by Mike Blake/Reuters)

Rescue workers carry a pig out from a damaged house after Saturday's earthquake hit Lushan county, Ya'an, Sichuan province, April 22, 2013. The earthquake left 193 dead, 25 missing and 12,211 injured as of 6 a.m. Tuesday, according to Xinhua News Agency. Picture taken April 22, 2013. (Photo by Reuters/China Daily)

An orphaned baby elephant walks through mud as tourists take pictures at the David Sheldrick Wildlife Trust Nursery within Nairobi National Park, near Kenya's capital Nairobi April 21, 2013. The orphanage cares for baby elephants and sometimes baby rhinos which have been orphaned by poachers, or lost or abandoned for natural reasons. The orphaned elephants raised by the Trust are returned to join the elephant population in Tsavo National Park when they mature between eight to ten years old. (Photo by Darrin Zammit Lupi/Reuters)

Paramilitary policemen collect dead fishes at an aquaculture facility in Lushan county, after the earthquake hit on Saturday, Ya'an, Sichuan province, April 24, 2013. More than 10 tons of fishes in the facility died as the Qingyi river, the water supply to the facility was cut off by the earthquake. The dead fishes collected will be sterilized and buried underground to avoid causing any possible epidemic. (Photo by Reuters/China Daily)

A duck swims a window, viewed from inside Anderson Eye Care at the Riverfront Plaza Building in downtown Grand Rapids, Mich., as The Grand River crests on Monday, April 22, 2013, at an all time high of 21.85 feet, a full 2.2 feet above the record set in 1985, in downtown Grand Rapids. Previous water levels can be seen marked on the wall. (Photo by Cory Morse/AP Photo/The Grand Rapids Press)

In this photograph taken on April 8, 2013, an endangered six month old male baby orangutan rescued from a pet owner learns to climb a tree while undergoing rehabilitation at the Sumatran Orangutan Conservation Program quarantine area in Sibolangit village located in Indonesia's Sumatra island. According to environmentalists poachers kill or maim the mother orangutan to take her baby. Experts believe there are about 50,000 to 60,000 of the two species of orangutans left in the wild, 80 percent of them in Indonesia and the rest in Malaysia.They are faced with extinction from poaching and the rapid destruction of their forest habitat, mainly to create palm oil plantations. Environmental groups are pushing for stronger forest and wildlife protection and conservation as April 22, 2013 marks Wold Earth Day. (Photo by Romeo Gacad/AFP Photo)

A giant panda rests on a tree “panda kindergarten”, a refuge for baby pandas, inside Bifengxia giant panda base in Ya'an, Sichuan province April 26, 2013, after an earthquake hit Lushan on April 20, some 20 miles (32 km) away. According to local reports, more than half of the pandas in Bifengxia were resettled from Wolong panda base after an 7.9 earthquake in 2008 killed nearly 70,000 people. (Photo by Reuters/Stringer)

A dog looks on amid trash as polluted waters flow down a canal on the outskirts of Ahmedabad, India, during World Earth Day on April 22, 2013. World Earth Day is observed each April 22, during which events are held worldwide to demonstrate support for environmental protection. (Photo by Sam Panthaky/AFP Photo)

A bonobo looks through a window at the Wilhelma Zoo in Stuttgart, southern Germany. The bonobos of the Zoo just have moved to a new indoor enclosure. In the wild, the great apes live in the Congo Basin in Africa. (Photo by Franziska Kraufmann/Getty Images)

A seagull sits in front of sunbathers in beach chairs on the island of Borkum in the Northern Sea, Germany, Tuesday, April 23, 2013. (Photo by Ingo Wagner/AP Photo/Dpa)

Baby gorilla born at the Burger's Zoo in Arnhem (Netherlands), relax on the lap of her mother on the lawn, on April 25, 2013. (Photo by Action Press/Honopix/Estadão Conteúdo)

A black bear watches a gathering crowd of people from a safe perch in a tree high above the Campbell Creek trailhead in Anchorage, Alaska, on April 21, 2013. (Photo by Mark Thiessen/Associated Press)

A giant panda climbs a tree in the Bifengxia Base of China Conservation and Research Centre for the giant panda after a magnitude 7.0 earthquake hit the city of Ya'an, southwest China's Sichuan province on April 20, 2013. About 60 shocked giant pandas are now under the care of breeders. More than 100 people were killed and 3,000 injured when a strong earthquake shook southwest China on April 20, wrecking homes and triggering landslides in an area devastated by a major tremor in 2008. (Photo by AFP Photo)

Pictured a four legged visitor wants in on the photoshoot, with the Senior players, at the Launch of the 2013 Cork County Football Championship, at Pairc Ui Chaoimh, Cork, on April 24, 2013. (Photo by Jim Coughlan)

A Selkirk Rex cat is one of more than 400 breeds of cats being presented at the World Cat Federation two-day show in Dortmund, Germany, on April 21, 2013. (Photo by Frank Augstein/Associated Press)

A young porcupine sits in a glove-protected hand in the Magdeburg Zoo in Magdeburg, Germany, on April 23, 2013. This porcupine was born on April 1. (Photo by Jens Wolf/Zuma Press)

Bears Maxi and Schnute, right, eat inside the Koellnischer Park in Berlin, Germany, on April 22, 2013. (Photo by Paul Zinken/EPA)

A pig is seen in a damaged pigsty on the second day after an earthquake hit the Longmen township of Lushan County, China, on April 21, 2013. (Photo by Jason Lee/Reuters)

A polar bear cub rubs noses with its mother named Cora at Brno Zoo on April 24, 2013 in Brno, Czech Republic. (Photo by AFP Photo)

A small dog looks through porch rails to watch passersby on a sunny morning Monday, April 22, 2013, in West New York, N.J. (Photo by Mel Evans/AP Photo)

Shomili, a four-and-a-half-month-old greater one-horned rhino, whose name means beautiful or elegant in Bengali, stuck close to her mother, Sundari, as she was released into the 40-acre Asian Savanna habitat April 23, 2013 at the San Diego Zoo in San Diego, California. (Photo by Ken Bohn/AFP Photo)

The Peterbald cat “Barcelona” is displayed at the World Cat Exhibition in Dortmund April, 21, 2013. More than 400 breeds of cats are being presented at the World Cat Federation two-day show. (Photo by Ina Fassbender/Reuters)

A white stork holds grass to make a nest on April 24, 2013 in Luetzelsee near Hombrechtikon, Switzerland. (Photo by Steffen Schmidt/EPA)

A thorough checkA veterinarian examines one of the four Asiatic lion cubs at the Budapest Zoo and Botanic Garden on Wednesday, April 24, 2013. Shirwane, the mother and resident of the Zoo since 2010, gave birth to quadruplets on February 15. (Photo by Attila Kisbenedek/AFP Photo)

Huckleberry, owned by Steven and Stephanie Hein of Norwalk, Iowa, sits on the throne after being crowned the winner of the 34th annual Drake Relays Beautiful Bulldog Contest, on April 22, 2013. (Photo by Charlie Neibergall/Associated Press)

Living green flying frogs (Rhacophorus reinwardtii) are presented at the exhibition “Bottomless – through the air and underwater” at the State Museum of Natural History in Karlsruhe, Germany, 24 April 2013. The exhibition takes place from 25 April to 27 October. (Photo by Uli Deck/EPA)

Frogs spawn in a pond outside St. Petersburg, Russia, on April 26, 2013. (Photo by Dmitry Lovetsky/Associated Press)

A worker grooms away tracks after an alligator crossed through a sand trap on the 14th hole during the first round of the PGA Tour Zurich Classic tournament at TPC Louisiana in Avondale, Louisiana, on April 25, 2013. (Photo by Gerald Herbert/Associated Press)