Crystal Palace's mascot Kayla, a North American Bald Eagle, flies in the stadium to entertain fans ahead of the English Premier League soccer match between Crystal Palace and Manchester City at Selhurst Park stadium in London, on March 27, 2014. (Photo by Kirsty Wigglesworth/Associated Press)

Miss Coco Puffs, a Chihuahua mix, and Jack, a Pomeranian, ride in a stroller on Rodeo Drive during a block party celebrating the 100th anniversary of Beverly Hills, Calif., on April 26, 2014. (Photo by Kevork Djansezian/Reuters)

A shepherd dog directs a Hungarian Grey bull during the celebration of the start of the new grazing season at the Great Hungarian Plain in Hortobagy, east of Budapest, on April 26, 2014. (Photo by Laszlo Balogh/Reuters)

A boy rests his pet pigeon on his head as he plays with it in a slum in Mumbai April 28, 2014. (Photo by Danish Siddiqui/Reuters)

A man leads a horse on Xolotlan lake off the coast near Mateares town April 29, 2014. Xolotlan Lake was the epicenter of the recent earthquake that struck Nicaragua.President Daniel Ortega's government has maintained a red alert in some municipalities of Nicaragua after three major earthquakes occurred recently. (Photo by Oswaldo Rivas/Reuters)

White Bengal tiger Clara plays with one of her three cubs during a news presentation at Huachipa's private zoo in Lima, April 29, 2014. The 2-month-old cubs, yet unnamed, were born in captivity at the park. (Photo by Mariana Bazo/Reuters)

A man cleans the teeth of a hippopotamus at a wildlife reserve park in Guangzhou, in China’s Guangdong province, on April 29, 2014. (Photo by Alex Lee/Reuters)

A fire salamander (Salamandra salamandra) sits on moss near Geraberg, Germany, 28 April 2014. A project of the Nature Foundation David ai,s to renaturalize 80 km of spring-fed brooks in the Thuringian Forest until 2017 in order to provide a habitat for rare species like the fire salamander. (Photo by Michael Reichel/EPA)

An Orangutan enjoys a chunk of icy frozen orange juice given by zoo officials to cool down from the heat at Chiang Mai Zoo in Chiang Mai province, northern Thailand, 28 April 2014. The temperature in Thailand's northern province reached 36.1 degree Celsius on 28 April 2014 and the heat is forecasted to rise further due. (Photo by Pongmanat Tasiri/EPA)

Lupita takes part in the Fiesta Pooch parade and contest, Saturday, April 26, 2014, in San Antonio. The annual event is part of the Fiesta San Antonio celebration. (Photo by Eric Gay/AP Photo)

One of two young Young Palawan Leopard cats called Ilian and Taytay sits in its enclosure at zoo Tierpark Berlin in Berlin, Germany, 29 April 2014. (Photo by Tim Brakemeier/EPA)

Visitors look at fish in the aquarium inside the Chimelong Ocean Kingdom in Zhuhai on April 29, 2014. The park which claims to be the world's largest ocean theme park was built at an estimated cost of USD 3.3 billion and opened in March of this year. (Photo by Mark Ralston/AFP Photo)

Young visitors walk past of the large jaws of a sperm whale during the 'Whales: Giants of the Deep' exhibition at the Fernbank Museum of Natural History in Atlanta, Georgia, USA, 01 May 2014. The exhibit, presented by the Museum of New Zealand Te Papa Tongarewa, runs through 24 August. (Photo by Erik S. Lesser/EPA)

A trainer coaxes two black bears to box at an animal park during an event dubbed as the animal olympic games in Chongqing on May 1, 2014. The event attracts thousands of visitors enjoying the four-day Mayday holidays in China. (Photo by AFP Photo/STR)

Great white pelicans swim on a pond at the zoo in Krefeld, western Germany, on April 30, 2014. (Photo by Roland Weihrauch/AFP Photo/DPA)

A lion is given a shower to cool down as temperatures rise at a zoological park in the Indian city of Jamshedpur on May 2, 2014. As temperatures continued to rise across northern India, Meteorological Department officials predicted a high of 42 degrees by the end of the week. (Photo by AFP Photo/STR)

A male peacock displays its tail feathers and shakes them to attract the attention of female peacocks at Gut Aiderbichl in Henndorf, Austrian province of Salzburg, Saturday, April 26, 2014. Gut Aiderbichl is a place of mercy for rescued animals. (Photo by Kerstin Joensson/AP Photo)

A picture taken on April 25, 2014 shows a Java mouse-deer cub, one of the world's smallest hoofed animals, and its mother at the Fuengirola Biopark, near Malaga. The latest specimen of the world's tiniest deer – a rare species no bigger than a hamster – has been born in a nature park in southern Spain, conservationists said today. The baby “deer-mouse” became just the 43rd living member of this species in Europe when it was born on April 9. (Photo by Jorge Guerrero/AFP Photo)

A Sri Lankan leopard snarls in his cage at a zoo in Dehiwala near Colombo on April 29, 2014. The Sri Lankan leopard is a leopard subspecies native to Sri Lanka. (Photo by Lakruwan Wanniarachchi/AFP Photo)

This April 20, 2014, photo shows bison grazing along a state highway near West Yellowstone, Mont. Montana's top wildlife officials on Wednesday April 23, 2014, sought to scale back expectations for a state-wide bison conservation plan following a backlash from ranchers opposed to restoring the animals to their historical habitat. (Photo by Matthew Brown/AP Photo)

A Humboldt penguin swims through its basin at the zoo in Krefeld, western Germany, on April 30, 2014. (Photo by Roland Weihrauch/AFP Photo/DPA)

Frankie Dettori celebrates after ridding Tac De Boistron to victory in The Longines Sagari Stakes at Ascot racecourse on April 30, 2014 in Ascot, England. (Photo by Charlie Crowhurst/Getty Images)

An egret perches on foliage in a lake at a zoo in Dehiwala near Colombo on April 29, 2014. Sri Lanka has a rich bird life with approximately 433 species recorded. (Photo by Lakruwan Wanniarachchi/AFP Photo)

A couple of ducklings are out for a stroll through a Chambersburg, Pa., parking lot during the afternoon rain Tuesday, April 29, 2014. A flood watch is in effect for Franklin County, Pa., through Thursday morning. (Photo by Markell DeLoatch/AP Photo/Public Opinion)

A tiger sticks out his tongue during a rainy spring day at the zoo in Dortmund, Germany, Tuesday, April 29, 2014. (Photo by Martin Meissner/AP Photo)

A camel enjoys the last weeks of his winter pelt before it drops away at the zoo in Dortmund, Germany, Tuesday, April 29, 2014. (Photo by Martin Meissner/AP Photo)

A four weeks old ring-tailed lemur (Lemur catta) plays in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (Photo by Jens Meyer/AP Photo)

A herd of Racka sheep, an ancient Hungarian sheep species, is driven by a shepherd as it moves from its winter habitat to its summer pasture in the puszta or Hungarian steppe of Hortobagy, 183 kilometers east of Budapest, Hungary, 26 April 2014. Sheep are traditionally driven to their summer pasture at around St. George's Day in the Hortobagy region. (Photo by Zsolt Czegledi/EPA)

In this photo made Saturday April, 26, 2014, and provided by Brian Genest, a squirrel clings to the back of Brian Genest at John Chestnut Park near Tampa, Fla. Genest, 17, of Auburn, Maine, said the flash and noises from his camera phone scared the animal, which climbed under the teen's shirt and hung onto his back. (Photo by Paula Wright/AP Photo)

In this photo made Saturday April, 26, 2014, and provided by Brian Genest, a squirrel approaches Brian Genest as he takes a photo of himself at John Chestnut Park near Tampa, Fla. Genest, 17, of Auburn, Maine, said Thursday, May 1, 2014, he saw what appeared to be a friendly squirrel on a hand rail while walking through a park. Genest took a selfie of himself and the squirrel. But the flash and noises from his camera phone scared the squirrel, which climbed under his shirt and hung onto his back before scampering back out. “He was just in that spot where my arm can't reach him”, Genest said. “I threw myself on the ground, and that scared him off”. (Photo by Brian Genest/AP Photo)

Exercise rider Abel Flores takes Kentucky Derby hopeful Tapiture for a morning workout in the rain at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (Photo by Garry Jones/AP Photo)

A nun walks her dog past Haitian immigrants at the Nossa Senhora da Paz Catholic church, where the immigrants are staying in a shelter, in the Glicerio neighborhood of Sao Paulo. (Photo by Nacho Doce/Reuters)

This picture taken on April 28, 2014 shows a new-born African lion cub sucking milk in Qingdao Forest Wildlife World in Qingdao, east China's Shandong province. Five new lion cubs were born last week at the wildlife park. (Photo by AFP Photo)

Asian small-clawed otter pups, born in January, join their family to play, tumble and tussle at their public debut at the Woodland Park zoo in Seattle, on April 26, 2014. (Photo by Jordan Stead/AP Photo)

In this photo taken April 14, 2014 provided by the San Francisco Zoo, is a 10-month-old red panda, the newest resident of the San Francisco Zoo. The small male panda native to the eastern Himalayas and western China will be installed in a new enclosure. His new home comes complete with a custom-made treehouse built by the crew from the Animal Planet show “Treehouse Masters”. The exhibit will open to the public on May 10. (Photo by Jessie Greger/AP Photo/San Francisco Zoo)

Hogle Zoo lion trainer Tonya Matelski uses food and conditioning in training one of the two recently acquired young male lions in the Zoo's new Lions' Hill exhibit, in Salt Lake City, Thursday May 1, 2014. The large enclosure has heated concrete, cool grottos, and a hill with perching rocks. Lions' Hill will be open for the public tomorrow. The larger part of African Savannah will open late May. (Photo by Al Hartmann/AP Photo/The Salt Lake Tribune)

Coolio, a rescued baby elephant seal, swims around in a tank at the Pittsburgh Zoo and PPG Aquariumm, Friday, April 25, 2014, in Pittsburgh. Coolio was blinded and almost died from injuries sustained before he was was found lying on Pebble Beach in Crescent City, California when he was three months old. The zoo partnered with the Northcoast Marine Mammal Center (NMMC) to provide a home to the blind yearling northern elephant seal. (Photo by Keith Srakocic/AP Photo)

In this handout photo provided by Sea World, a trainer wears an inflatable safety vest, Monday, April 28, 2014, in Orlando, Fla., whenever she works near the killer whales. This is another safety measure implemented after the 2010 death of a trainer who was dragged into a pool by an orca. The five-pound nylon vests can be inflated like an airplane life jacket and have a tube connecting to a small oxygen tank that fits in a pouch in the back, said Kelly Flaherty Clark, Sea World's curator of animal training. The vests took more than three years to develop with input from trainers, engineers and safety experts. (Photo by AP Photo/Sea World)

A “recortador” jumps over a bull during a bullfight in Madrid, Spain, Friday, May 2, 2014. “Recortadores” is a bloodless type of bullfighting where performance consists of dodging and acrobatically leaping over a bull, and the ones who dare to get closer to the bull and show less fear are the winners. (Photo by Daniel Ochoa de Olza/AP Photo)

Lilly the dachshund gets an Atlanta Braves mohawk wig from her owner Kara Hesch while attending the Bark in the Park event at the Atlanta Braves host the Cincinnati Reds in MLB baseball game at Turner Field in Atlanta, Georgia, USA, 27 April 2014. (Photo by Erik S. Lesser/EPA)

In this Sunday, April 27, 2014 handout photo provided by Busch Gardens Tampa, mother armadillo Zowie, left, welcomes her newborn Southern three-banded armadillo baby at the Animal Ambassador Team, in Tampa, Fla. The baby was able to walk and roll into a ball within moments of its birth. Southern three-banded armadillos are the only species of armadillo that can fully roll up into a ball. (Photo by AP Photo/Busch Gardens Tampa)

A statue of Saint Domenico covered with live snakes is carried by the faithful during an annual procession in the streets of Cocullo, in the Abruzzo region, on May 1st, 2014. (Photo by Tiziana Fabi/AFP Photo)

A nine-week old greater one-horned rhino calf and his mother were released into the Asian Plains exhibit this morning at the San Diego Zoo Safari Park. Thursday May 1, 2014 was the first time the male calf, born on February 25, had experienced such diverse terrain, having spent his first few weeks in a smaller maternity yard, and he was eager to explore the 40-acre habitat. The calf is named Parvesh, which means “lord of celebration” in the Hindi language. He may be young, but he is hefty and is already approaching 300 pounds. This is the second calf born to Alta; his sister, Charlees, who is 2 years old, was one of the first to greet the pair when they came into the field exhibit. (Photo by Ken Bohn/AP Photo/San Diego Zoo Safari Park)