Pelicans try to catch a fish thrown by a fisherman on a fishing pier in Paracas National Reserve in Ica, March 15, 2015. The Paracas reserve, which aims to preserve the marine ecosystem, is located on the coastal areas and tropical desert of Peru. (Photo by Mariana Bazo/Reuters)

A pit bull dog named OJ wears sunglasses as he stands on The Embarcadero with his owner in San Francisco, California March 16, 2015. (Photo by Robert Galbraith/Reuters)

A tiger claws a wooden plank in a cage during a media tour organised by circus workers union, to show animals from some circuses that have already shut, in a town called Tizayuca, near Mexico City March 9, 2015. Mexico is searching for homes for at least 2,000 tigers, elephants, giraffes, zebras and other exotic beasts that will soon be banned from the country's circuses. Circus owners are worried about the fate of their animals, which they say are too expensive to keep once the ban kicks in, while government and zoo officials are grappling with a myriad of difficulties in relocating animals raised to perform tricks under the big top.The prohibition does not take effect until July 8, but many circuses have already shut down. The legislation stipulates that such animals should evolve in their natural habitat and aims to avoid animal cruelty that civil organizations have long lobbied against. (Photo by Henry Romero/Reuters)

Cows lean towards a cat at the livestock breeding complex and collective farm named after Vasily Chapaev near the Russian southern city of Stavropol, March 17, 2015. (Photo by Eduard Korniyenko/Reuters)

Snorkelers interact with a Florida Manatee inside of the Three Sisters Springs in Crystal River, Florida in this file photo taken January 15, 2015. A record number of manatees – 6,063 – were counted during a statewide survey in February, state officials announced March 17, 2015, exceeding the previous high number by nearly 1,000. (Photo by Scott Audette/Reuters)

A Two-month-old white bengal tiger cub cleans itself at Gyor Zoo in Gyor, west of Budapest, March 20, 2015. (Photo by Bernadett Szabo/Reuters)

A zookeeper feeds a two-month-old white bengal tiger cub at Gyor Zoo in Gyor, west of Budapest, March 20, 2015. (Photo by Bernadett Szabo/Reuters)

Two-month-old white bengal tiger cubs are pictured at Gyor Zoo in Gyor, west of Budapest, March 20, 2015. (Photo by Bernadett Szabo/Reuters)

Two-month-old white bengal tiger cub growls during a medical examination at Gyor Zoo in Gyor, west of Budapest, March 20, 2015. (Photo by Bernadett Szabo/Reuters)

A two-month-old white bengal tiger cub sleeps at Gyor Zoo in Gyor, west of Budapest, March 20, 2015. (Photo by Bernadett Szabo/Reuters)

A close up of a white pelican at the ZSL Whipsnade zoo on March 03, 2015 in Whipsnade, England. (Photo by Tony Margiocchi/Barcroft Media)

A photo made available on 16 March 2015 shows Kiki the dog sniffing at Malor the lion cub with in Lierfeld, Germany, 11 March 2015. Lira, the lion mother, abandoned her offspring four weeks ago at the Eifel Zoo in Luenebach, Germany. Isabelle Wallpott, the director of the zoo, is now taking care of the lion cub at home. (Photo by Harald Tittel/EPA)

A full-grown Pygmy Hog (Porcula salvania) is seen in Assam State Zoo in Guwahati, capital city of northeastern Assam state, India on March 9, 2015. Assam State Zoo has become the only zoo in the world where Pygmy Hogs have been introduced. Pigmy Hog, a critically endangered suid, is at the brink of extinction and only a viable population (less than 100) of the species exists in the Assam's Manas Tiger Reserve and Nameri Wildlife Sanctuary. They are about 55 to 71 cm long and stand at 20–30 cm (7.9-11.8 in), with a tail of 2.5 cm (1 in). They weigh 6.6-11.8 kg. (Photo by Luit Chaliha/ZUMA Press)

Animals at Hagenbeck Zoo in Hamburg, Germany, March 10, 2015. (Photo by Action Press/ZUMA Wire)

A turtle walks by a crocodrile the Rosy Walther zoo, in the El Picacho protected area, 18 km north of Tegucigalpa, on March 6, 2015. (Photo by Orlando Sierra/AFP Photo)

A jaguar in the Rosy Walther zoo, in the El Picacho protected area, 18 km north of Tegucigalpa, on March 6, 2015. (Photo by Orlando Sierra/AFP Photo)

A bat hangs from the roof of a cave in Mikulov, Czech Republic, on March 9, 2015. Up to six hundred bats spend the winter here in the caves. (Photo by Radek Mica/AFP Photo)

A baby tiger Dragan plays on March 10, 2015 in its enclosure at Eberswalde's zoo. (Photo by Patrick Pleul/AFP Photo/DPA)

A mother Koala and her newly emerged unnamed Joey in the Australia section of the Los Angeles Zoo, California on March 12, 2015. The kangaroo and koala joeys which are between 7-9 months old are finally emerging from their mothers pouches as spring weather arrives in the city. (Photo by Mark Ralston/AFP Photo)

A mother Kangaroo and her newly emerged unnamed joey relax in the Australia section of the Los Angeles Zoo, California on March 12, 2015. The kangaroo and koala joeys which are between 7-9 months old are finally emerging from their mothers pouches as spring weather arrives in the city. (Photo by Mark Ralston/AFP Photo)

A young mandrill enjoys a carrot on March 16, 2015 at the zoo in Dresden, eastern Germany. (Photo by Matthias Hiekel/AFP Photo/DPA)

A sick and malnourished sea lion pup undergoes an examination at the Marine Mammal Center on March 18, 2015 in Sausalito, California. For the third winter in a row, hundreds of sick and starving California sea lions are washing up on California shores, with over 1,800 found and treated at rehabilitation centers throughout the state since the beginning of the year. The Marine Mammal Center is currently caring for 224 of the emaciated pups. (Photo by Justin Sullivan/Getty Images)

A peacock displays his feathers on March 17, 2015 at the zoo in Magdeburg, eastern Germany. (Photo by Jens Wolf/AFP Photo/DPA)

Chilkat, one of Jessie Royer's dogs, gets some shuteye at the Koyuk, Alaska, checkpoint during the Iditarod Trail Sled Dog Race, Monday, March 16, 2015. (Photo by Loren Holmes/AP Photo/Alaska Dispatch News)

Sheep jump through the snow near Castleside, England, as Britain was bracing itself for more snow as winds from the east sweep across the country, Friday, March 13, 2015. After a week of blue skies and sunshine, temperatures are turning markedly cooler because of a chilly blast from Scandinavia. (Photo by Owen Humphreys/AP Photo/PA Wire)

A small dog peers from a car at an Ukrainian army checkpoint near Kurakhove, Ukraine, Tuesday, March 3, 2015 on a road leading to Russia-backed separatists held territory. (Photo by Vadim Ghirda/AP Photo)

Several baby Komodo dragons (Varanus Komodensis) in a quarantine room of Surabaya zoo in Surabaya, East Java, Indonesia, March 19, 2015. Twelve Komodo eggs from a total 29 eggs have hatched in the last 2 months at Surabaya zoo, official said. The Komodo dragon is a protected species of which only approximately 4000 to 5000 living in the wild. (Photo by Fully Handoko/EPA)

A horse looks out of a tent, waiting for its appearance at the equestrian sports world fair Equitana in Essen, Germany, Friday, March 20, 2015. (Photo by Martin Meissner/AP Photo)

A handout image released by the Taronga Zoo shows Veiled Chameleon hatchlings at Taronga Zoo in Sydney, Australia, 11 March 2015. Taronga has welcomed more than 20 baby chameleons, with the last of three clutches of eggs hatching this week. Veiled Chameleons, or Chamaeleo calyptratus, are native to Saudi Arabia and Yemen and can live up to five years. (Photo by EPA/Taronga Zoo)

Melbourne Zoo's Asian Elephant's enjoy a new mud wallow in their enclosure to celebrate the 12 year anniversary of the Trail of the Elephants and also Thailand's National Elephant Day, in Melbourne, Australia, 13 March 2015. Thailand's National animal is the elephant. (Photo by Tracey Nearmy/EPA)

Pregnant elephant cow “Hoa” is watched by visitors as she takes a bath in the swimming pool of the elephant temple “Ganesha Mandir” at the zoo in Leipzig, Germany, 17 March 2015. Three years ago Hoa was pregnant for the first time but tragically she killed her calf after giving birth. The birth of the new calf is expected in the next days. (Photo by Jan Woitas/EPA)

Brown bear Oska (L) and Roni (R) play in a bear sanctuary near the village of Mramor, Kosovo, 18 March 2015. The Bear Sanctuary Pristina has currently 16 brown bears in custody rescued from the private restaurants around Kosovo. All privately kept brown bears lived in small cages at restaurants. They were born mostly in the forests of Kosovo or Albania and snatched from their mothers by animal dealers. (Photo by Valdrin Xhemaj/EPA)

Female gorilla “Bua Noi” (“Little Lotus”) looks through the bars of her cage at the Pata Zoo situated on the top floor of a shopping center in Bangkok, Thailand, 17 March 2015. The zoo denied it agreed to free the gorilla and give her to another zoo while animal rights activists initiated a petition by collected more than 35,000 signatures calling to free the gorilla. “Bua Noi” was bought to Thailand and has been held captive at the zoo on the rooftop of a department store for more than 27 years. Her confinement has sparked controversy and protests by animal rights activists who say she needs better living conditions and who are in general against the zoo's location in a shopping center. (Photo by Rungroj Yongrit/EPA)

Animal keeper Caiti Robinson weighs a male fennec fox kit Thursday, March 12, 2015, behind the scenes of the desert habitats exhibit at the Chattanooga Zoo in Chattanooga, Tenn. The male is one of two 6-week-old kits born to a single fennec fox mother at the zoo in January. Though they were weighing the kits every other day, now that they are older the zoo has transitioned to weighing them once a week. (Photo by Doug Strickland/AP Photo/Chattanooga Times Free Press)

A fennec fox kit plays in a cardboard box in its enclosure Thursday, March 12, 2015, in the desert habitats exhibit at the Chattanooga Zoo in Chattanooga, Tenn. The kit is one of two 6-week-olds born to a single fennec fox mother at the zoo in January. (Photo by Doug Strickland/AP Photo/Chattanooga Times Free Press)

A handout picture made available by the Wilhelma zoo on 17 March 2015 shows polar bears Corinna (L) and summer guest from Nuremberg, Felix (R), meeting for the first time in the polar bear enclosure in the Wilhelma in Stuttgart, Germany, 17 March 2015. Corinna (25) and Felix (13) are supposed to mate and produce offspring, a purpose Felix has fulfilled a few times already. (Photo by Harald Knitter/EPA/DPA)

Twelve-week-old female tiger cub Alisha sits in her cage at Tierpark Berlin, Germany, 05 March 2015. The little Amur tiger is moving to Eberswalde Zoo on 10 March. (Photo by Gregor Fischer/EPA)

A man interacts with a large crocodile nicknamed “Justin Bieber” on the banks of the Río Grande in Tarcoles, 110 km southwest of San Jose on March 7, 2015. In Tarcoles tourists can embark onto a boat to sail along the river, swarming of crocodiles to see them in their habitat and watch the men who disembark to interact with the huge reptiles that can be up to seven-metre long. (Photo by Ezequiel Becerra/AFP Photo)

A huge crocodile nicknamed “Lady Gaga” on the banks of the Río Grande in Tarcoles, 110 km southwest of San Jose on March 7, 2015. (Photo by Ezequiel Becerra/AFP Photo)

Walrus Baby Thor at the Hagenbeck Zoo in Hamburg on March 17, 2015. He is Germany's first walrus baby, date of birth: 06.15.2014 / 190 Kg weight now. (Photo by Werner Struss/Startraksphoto.com)

A mother Kangaroo and her newly emerged unnamed Joey in the Australia section of the Los Angeles Zoo, California on March 12, 2015. The kangaroo and koala joeys which are between 7-9 months old are finally emerging from their mothers pouches as spring weather arrives in the city. (Photo by Mark Ralston/AFP Photo)