In this Thursday, April 16, 2015 photo provided by Robert MacFarlane, a raccoon climbs up a skyscraper in downtown Toronto. Social media was abuzz Thursday with the photo of the raccoon peering from between the metallic rungs of a crane 58 stories high. (Photo by Robert MacFarlane)

Tuah, the five month-old Bornean orangutan looks on in the Great Ape Building at Utah's Hogle Zoo Friday, April 10, 2015, in Salt Lake City. Tuah's parents, Eve and Elijah, both passed away last fall; Eve just a few weeks after Tuah's birth. After four months of round-the-clock care from zookeepers and his older sister, an orphaned orangutan baby whose father gained national fame by correctly picking the Super Bowl winner seven straight years is ready to meet the public. (Photo by Rick Bowmer/AP Photo)

Tuah, the five month-old Bornean orangutan looks on in the Great Ape Building at Utah's Hogle Zoo Friday, April 10, 2015, in Salt Lake City. (Photo by Rick Bowmer/AP Photo)

Tuah, the five month-old Bornean orangutan looks on in the Great Ape Building at Utah's Hogle Zoo Friday, April 10, 2015, in Salt Lake City. (Photo by Rick Bowmer/AP Photo)

Newborn white tiger cubs look on together at the Saitama Tobu zoo, in Shiraoka, north of Tokyo,Thursday, April 16, 2015. Ahead of the grand debut of the four cubs in a week, the zoo went ahead for a trial public appearance to test the cubs' reactions. The blue-eyed cubs with coats of black stripes on white were born on January 25, – mother Cara's second time giving birth in the zoo. (Photo by Miki Toda/AP Photo)

Garland County Sheriff's Department Cpl. Fred Hawthorn spreads some hay for five buffalo on Whispering Hills Road in Hot Springs, Ark., Thursday, April, 16, 2015. Hot Springs police say six buffaloes escaped from a nearby farm Thursday and spent the day roaming neighborhoods and avoiding sheriff's deputies, officers and volunteers. One animal was hit by a car and returned to the farm. Three were tranquilized Thursday evening. The whereabouts of the other two are unknown. (Richard Rasmussen/The Sentinel-Record via AP Photo)

Chimpanzees gather together in their compound at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Flamingos with their necks intertwined seen at ZSL Whipsnade Zoo on April 10, 2015 in Bedfordshire, England. (Photo by Tony Margiocchi/Barcroft Media)

A sea lion keeps itself cool during the unseasonably warm spring-time weather, at Whipsnade Zoo on April 14, 2015 in Bedfordshire, England. (Photo by Tony Margiocchi/Barcroft Media)

A monkey (Mandrillus sphinx) plays at a Zoo in Chengdu, Sichuan province, southwest China on 17th April 2015. (Photo by Yong Wang/Cpressphoto/ZUMAPress)

In this Sunday, April 12, 2015, photo, a black bear sow with four yearling cubs forage through garbage cans in an alley on Government Hill in Anchorage, Alaska. Residents believe the animals are the same bears that were in the area last summer. (Photo by Bill Roth/Alaska Dispatch News via AP Photo)

One of the Western lowland gorillas holds it's head near the construction area for the new Islands Exhibit at the Pittsburgh Zoo and PPG aquarium sits as it sits behind a log on Thursday, April 16, 2015, in Pittsburgh. (Photo by Keith Srakocic/AP Photo)

Polar bear Aurora is presented at the Aquarium of Sao Paulo, Brazil, 14 April 2015. Two bears (Aurora and Peregrino) were moved from the zoo of Kazan, Russia, to the Sao Paolo aquarium, considered the biggest in Latin America. (Photo by Sebastiao Moreira/EPA)

Polar bears, which arrived from Russia last December, are pictured at Sao Paulo Aquarium April 14, 2015. The polar bears will be presented to the public on Thursday, when a new area of the aquarium will be inaugurated. (Photo by Jose Patricio/Reuters)

A polar bear, which arrived from Russia last December, is pictured at Sao Paulo Aquarium April 14, 2015. (Photo by Jose Patricio/Reuters)

A polar bear, which arrived from Russia last December, is pictured at Sao Paulo Aquarium April 14, 2015. (Photo by Jose Patricio/Reuters)

A gosling peers out from its mother's wings Wednesday, April 15, 2015, in Santa Clara, Calif. (Photo by Marcio Jose Sanchez/AP Photo)

In this April 9, 2015 photo, two young purple gallinule swim in the recycled waters at the Wakodahatchee Wetlands in Delray Beach, Fla. More than 150 species, from migrating birds to native tropical birds, have been spotted at Wakodahatchee. (Photo by J. Pat Carter/AP Photo)

In this April 9, 2015 photo, a wood stork flies back to its nest at the Wakodahatchee Wetlands in Delray Beach, Fla. The wetlands site is home to 60-80 pairs of nesting wood storks this year. (Photo by J. Pat Carter/AP Photo)

In this April 9, 2015 photo, an immature anhinga reaches inside an adult anhinga's mouth during nesting season at the Wakodahatchee Wetlands in Delray Beach, Fla. More than 150 species of birds have been seen at the site. (Photo by J. Pat Carter/AP Photo)

A cat is pictured as it sleeps in an apartment in Sieversdorf, northeastern Germany, on April 4, 2015. (Photo by Patrick Pleul/AFP Photo/DPA)

An Indonesian health officer vaccinates a puppy in Denpasar, Bali, Indonesia, 17 April 2015. The thousands of stray dogs on Bali's resort island of Indonesia have become a threat to the local tourism industry, especially since rabies arrived in 2008, but measures to cull them have sparked debate. A three-month vaccination drive will be launched in April, the sixth since the 2008 outbreak, with the aim of inoculating as close as possible to all of the island's dogs. Bali Governor Made Mangku Pastika urged residents to help out across the island, saying rabies was increasing and the government was running out of money to treat bitten humans, local media reported. (Photo by Made Nagi/EPA)

In this April 9, 2015 photo, an eight foot long alligator carries a Florida softshell turtle in his mouth at the Wakodahatchee Wetlands in Delray Beach, Fla. More than 150 species, from migrating birds to native tropical birds, have been spotted at Wakodahatchee. (Photo by J. Pat Carter/AP Photo)

Two Jaguar cubs are presented at the Leningrad city zoo in St. Petersburg, Russia, 15 April 2015. A black and spotted female jaguar cubs gave birth on 11 March. (Photo by Anatoly Maltsev/EPA)