Four-year-old British Bulldog "Bobo" skateboards past office workers during evening rush hour at Singapore's central business district May 8, 2015. REUTERS/Edgar Su

Sara the walrus performs during a show at the Dolphinarium in Istanbul, Turkey December 4, 2008. REUTERS/Osman Orsal

A woman pushes her Fiat 500 car as her dog sits inside, in a neighborhood of Rome, Italy March 23, 2012. REUTERS/Alessandro Bianchi

A Japanese macaque (or snow monkey) soaks in a hot spring at a snow-covered valley in Yamanouchi town, central Japan January 20, 2014. REUTERS/Issei Kato

A man cleans the teeth of a hippopotamus at a wild life reserve park in Guangzhou, Guangdong province, China April 29, 2014. REUTERS/Alex Lee

Namwan, a 10-year-old female monkey, takes a puff on a cigarette at a temple in Kanchanaburi, west of Bangkok, Thailand November 28. After being discarded by her owners at the temple, Namwan started to pick up and smoke used cigarette butts and has now become addicted to smoking. Namwan now asks passersby for a cigarette to help fuel the habit. REUTERS/Sukree Sukplang

A clown boxes with a kangaroo during an animals "Olympics" performance in the Shanghai Wild Animal Park, China September 28, 2006. REUTERS/Nir Elias

Mongolian wolf Heiko licks the mouth of wolf researcher Werner Freund in a sign of acknowledgement at Wolfspark Werner Freund, in Merzig, Saarland province, Germany January 24, 2013. REUTERS/Lisi Niesner

Brown bear (Ursus arctos) cub Medo plays with the Logar family dog in Podvrh village, central Slovenia June 1, 2011. The Logar family adopted the three-and-half-month-old bear cub that strolled into their yard. Although the family would like to prepare a fenced enclosure for it, veterinary authorities would prefer to move it into a shelter for wild animals. REUTERS/Srdjan Zivulovic

Piek, a four-year-old monkey, checks one-year-old Pom for lice at a temple in Ayutthaya, Thailand August 7, 2002. Both animals were abandoned at the temple by their owners a year earlier. Since then they have become playmates and taken care of each other. REUTERS/Sukree Sukplang

Kanchana, a 17-year-old macaque, "performs" a hit song during a monkey show in Lopburi province, Thailand May 30, 2003. REUTERS/Sukree Sukplang

A meerkat warms itself under the glow of a heat lamp in its enclosure at Taronga Zoo in Sydney, Australia July 3, 2003. REUTERS/Will Burgess

A chimpanzee eats its lunch using a spoon at Villa Lorena animal refugee center in Cali, Colombia October 20, 2009. REUTERS/Jaime Saldarriaga

Street musician James Bowen busks with cat Bob in Covent Garden in London, England March 13, 2012. Bowen has written a book named "A Street Cat Named Bob" about the experiences of the then-homeless pair and how they met. REUTERS/Luke MacGregor

Students watch Orange, a 5-year-old orangutan, wearing a Santa Claus costume, pedal a bicycle during a Yuletide season presentation inside a crocodile farm in Pasay city, metro Manila, Philippines November 26, 2014. REUTERS/Romeo Ranoco

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A baby monkey holds on to its mother in a swimming pool to escape the summer heat at Nanwan Monkey Island in Lingshui county, Hainan province, China June 29, 2010. REUTERS/Kevin Zhao

An elephant runs to kick a ball while playing in a soccer match during an Elephant Festival event at Sauraha in Chitwan, Nepal December 30, 2014. REUTERS/Navesh Chitrakar

A staff member measures the height of a black bear at a national forest park in Puer, Yunnan province, China November 16, 2014. REUTERS/Wong Campion

An Australian koala, that was born with a damaged eye, looks at a camera as it sits atop a branch in its enclosure at Wild Life Sydney Zoo, Australia April 3, 2014. REUTERS/David Gray

Seals dressed in military uniforms swim during a show marking the 70th anniversary of the end of World War Two, at an aquatic park in Irkutsk, Siberia, Russia, May 9, 2015. REUTERS/Evgeny Kozyrev

Jeremiah Gerbracht rides his Harley-Davidson motorcycle with his dog on Wilshire Boulevard in Los Angeles, California July 20, 2014. Gerbracht, a retired dog trainer, won a court ruling in 1996 allowing him to ride his motorcycle with a dog on board. REUTERS/Jonathan Alcorn

A woman takes a selfie with a sheep at a sheep cafe in Seoul, South Korea February 6, 2015. REUTERS/Kim Hong-Ji

A dog surfs at the 6th Annual Surf City surf dog contest in Huntington Beach, California September 28, 2014. REUTERS/Lucy Nicholson

A giant panda plays on a swing after snowfall at a wildlife park in Kunming, Yunnan province, China January 10, 2015. REUTERS/Wong Campion

With acupuncture needles sticking out of his face, legs, and back, Tirto, an eight-year-old male Komodo dragon undergoes traditional Chinese acupuncture treatment administered by veterinarian Oh Soon Hock at the Singapore Zoological Gardens, September 2, 2003. REUTERS/David Loh