A brown bear is checked by foreign veterinaries and local staff members at the Four Paws Bear Sanctuary in Pristina, on May 9, 2014. (Photo by Hazir Reka/Reuters)

Cows jump off the boat after arriving to the islands of Swina river reverse delta in the Wolin National Park, in Swinoujscie, northern Poland, 06 May 2014. Grazing of cows began from the beginning of May, something which successfully replaces the traditional method of mowing the grass. Due to grazing, unique species of plants are reviving and forming new breeding sites of rare species of birds. Grazing of the animals will continue to Fall. (Photo by Marcin Bielecki/EPA)

Thai officials dressed in traditional costumes feed oxen during the annual Royal Ploughing Ceremony in central Bangkok, on May 9, 2014. The ancient ploughing ceremony in Buddhist Thailand, overseen by Crown Prince Maha Vajiralongkorn, marks the end of the dry season and is meant to herald an auspicious start for the rice-planting season. (Photo by Chaiwat Subprasom/Reuters)

A picture made available on 09 May 2014 shows five-month old baby gorilla Jengo cuddling with his mother Kibara at the zoo in Leipzig, Germany, 08 May 2014. Gorilla boy Jengo becomes more independent from day to day and already explores his enclosure by himself. He will soon get a playmate because another gorilla girl was born in the zoo in March. (Photo by Hendrik Schmidt/EPA)

Scorpions are suspended in lollipops at the booth of a retailer selling edible insects for human consumption at the 2014 re:publica conferences on digital society on May 6, 2014 in Berlin, Germany. Advocates seeking to promote insects as food for people see insects as a major and cheap source of protein and a necessary means to fight global hunger. The conference brings together bloggers, developers, human rights activists and others to discuss the course of the digital future. Re:publica will run until May 8. (Photo by Sean Gallup/Getty Images)

Two caracara chicks beg for food as they sit in a basket at the Walsrode birds park in Walsrode, northwestern Germany, on May 7, 2014. In the wild, the birds of pray from the Falconidae family occur in an area ranging from southern North America to Tierra del Fuego. (Photo by Holger Hollemann/AFP Photo/DPA)

A Meercat at Zoo Frankfurt on May 8, 2014 in Frankfurt am Main, Germany. The Zoo in Frankfurt is the 2nd oldest in Germany and holds about 4500 individuals from about 500 animals species. (Photo by Hannelore Foerster/Getty Images)

A monkey drinks water from a tap on a hot afternoon on the outskirts of the Indian city of Bhubaneswar on May 6, 2014. Northern India is experiencing a heatwave, with high temperatures for the time of year. (Photo by Asit Kumar/AFP Photo)

Almost five months old baby gorilla Jengo looks at the photographer on May 8, 2014 at the zoo in Leipzig, eastern Germany. Jengo was born in December 2013 at the zoo. (Photo by Hendrik Schmidt/AFP Photo/DPA)

In this May 3, 2014, photo provided by the Alaska Department of Homeland Security and Emergency Management, caribou hitch a ride on an ice chunk in the Yukon River near Circle, Alaska. (Photo by Claude Denver/AP Photo/Alaska Department of Homeland Security and Emergency Management)

Desiree Smith comforts Misty after the dog was rescued from a home at the scene of a structure fire in Saint Clair, Pensylvania, on May 7, 2014. (Photo by Jacqueline Dormer/The Republican-Herald)

A great tit carries the excrement of its offspring out of a hole in the wall on May 8, 2014 in Petersdorf, eastern Germany. (Photo by Patrick Pleul/AFP Photo/DPA)

A dog stands beside street graffiti in Xochimilco, on the southern edge of Mexico City, May 7, 2014. In Xochimilco, busy markets stand side by side with colonial churches, and children ride to school in boats pushed by poles, along a network of canals and floating gardens. (Photo by Rebecca Blackwell/AP Photo)

Nine-day-old giraffe Bine licks the nose of its giraffe aunt Andrea at Friedrichsfelde Zoo in Berlin, Germany, Friday, May 9, 2014. The baby giraffe was born on 30 April during opening hours and numerous visitors were able to watch the birth. (Photo by Stephanie Pilick/AP Photo/DPA)

A Muslim boy rides a donkey on the outskirts of Bambari May 8, 2014. (Photo by Siegfried Modola/Reuters)

One of the two Red Panda cubs (right) born at the National Zoo and Aquarium gets a kiss from its mother Eilisha in Canberra, Australia, 08 May 2014. The Red panda is native to the eastern Hiimalaya's and China and is a threatened species. (Photo by Alan Porritt/EPA)

Lead soprano Hye-Youn Lee with a giant atlas moth at Butterfly World in Edinburgh Scotland, to promote Scottish Opera's upcoming production of Madama Butterfly, on May 7, 2014. (Photo by Danny Lawson/PA Wire)

A female Sumatran Tiger (Panthera Tigris) cub drinks from a bottle at Taman Sari zoo in Bandung, West Java Province, Indonesia, 08 May 2014. The Sumatran Tiger Cubs was born on 28 March 2014. There are fewer than 400 Sumatran tigers in the wild and their survival is threatened by deforestation and poaching, reports stated. (Photo by EPA/Salvozesta)

An egret feeds her chicks on the banks of the Brahmaputra River in the Panbazar area of Guwahati on May 9, 2014. Scores of egrets build their nests among trees in the populated Panbazar area, a major business centre of Guwahati, this time of the year. (Photo by Biju Boro/AFP Photo)

Female white rhinoceros Molly poses for the media at the Serengeti-Park near Hodenhagen, Germany, 07 May 2014. Molly turns 53 the same day and thus is considered to be the oldest living rhino in the world, according to reliable data from international studbooks. (Photo by Holger Hollemann/EPA)

Meerkat mother Hilde sits in her enclosure with her four babies at the zoo in Dresden, Germany, Wednesday, May 7, 2014. Since 2012 the meerkats of the Dresden zoo almost doubled. (Photo by Matthias Hiekel/AP Photo/DPA)

A pink sheep stands in a field in Ballintoy, Northern Ireland, on May 6, 2014, for the Giro d'Italia bicycle race, which has three stages in Ireland running from May 9-11. (Photo by Peter Morrison/Associated Press)

An osprey takes off from its nest inside a fire siren in Spring Lake N.J. on Tuesday May 6, 2014. The Jersey shore town has been forced to turn the siren off until fall to avoid disturbing the bird and any chicks it may have. First responders are notified of emergencies using pagers or cell phones. (Photo by Wayne Parry/AP Photo)

An Albany Police Department mounted unit officer salutes during a ceremony at the State of New York Police Officers Memorial on Tuesday, May 6, 2014, in Albany, N.Y. The names of 20 police officers who died in the the line of duty were added to the memorial, including 13 who died from ground zero-related illnesses after the 9/11 attacks. (Photo by Mike Groll/AP Photo)

An Indonesian jockey competes during a traditional Pacu Jawi cow race on the muddy unplanted paddy fields of Tanah Datar, West Sumatra province, Indonesia, 03 May 2014. Pacu Jawi is held by farmers before the start of the new harvesting season. (Photo by EPA/RIVO)

A Hindu holy man Mahant Narendragiri displays the indelible ink mark on his finger after casting his vote, as a cow stands beside him outside a polling station in Allahabad, in the northern Indian state of Uttar Pradesh, Wednesday, May 7, 2014. The multiphase voting across the country runs until May 12, with results for the 543-seat lower house of parliament expected on May 16. (Photo by Rajesh Kumar Singh/AP Photo)

Protesters run forward as they prepare to throw petrol bombs towards police during violent clashes in Santiago, Chile, on May 8, 2014. Tens of thousands of students protested in Chile in a mostly peaceful protest that was marred at the end by violent clashes with police. This was the first march demanding education reform since President Michelle Bachelet took power on promises of significant changes. (Photo by Luis Hidalgo/Associated Press)

A tapir stands in a lake at the Portobello Resort and Safari, where the Italian soccer team will be training and staying during the upcoming World Cup, in Mangaratiba, 103 km (64 miles) south of Rio de Janeiro, Brazil, Thursday, May 8, 2014. (Photo by Hassan Ammar/AP Photo)

A hummingbird makes an approach to a handy feeder on Monday, May 5, 2014 in Thurston County, Wash. (Photo by Steve Bloom/AP Photo/The Olympian)

Mango, a 19-year-old male Syrian brown bear, rests on a bed as zoo veterinarians and staff prepare him for surgery in the Ramat Gan Zoological Center's animal hospital near Tel Aviv, Israel, Wednesday, May 7, 2014. The 250 kilogram (550 pound) Syrian brown bear is going into surgery to repair a herniated disc in his back after it was discovered in an x-ray, said Sagit Horowitz, the zoological center spokeswoman. (Photo by Ariel Schalit/AP Photo)

Mango, a 19-year-old male Syrian brown bear is sedated as he is prepared for an operation to treat a slipped disk (T2 and T3) at the Ramat Gan Safari park, near Tel Aviv, on May 7, 2014. This is reportedly the first operation of its kind ever to takeplace. (Photo by Jack Guez/AFP Photo)

Mango, a 19-year-old male Syrian brown bear, rests on a bed as zoo veterinarians and staff prepare him for surgery in the Ramat Gan Zoological Center's animal hospital near Tel Aviv, Israel, on May 7, 2014. Surgeons will attempt to repair a herniated disc in the 550-pound bear's back after it was discovered in an x-ray. (Photo by Ariel Schalit/Associated Press)