A male Sri Lankan leopard (Panthera pardus kotiya) named Wil Pattu, the father of two cubs that were born in July, is seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopard cubs, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

A male Sri Lankan leopard (Panthera pardus kotiya) named Wil Pattu, the father of two cubs that were born in July, is seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopard cubs, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Seven year-old female Sri Lankan leopard (Panthera pardus kotiya) Yalla, who gave birth to two cubs in July, is seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards cubs, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS SOCIETY ENVIRONMENT) 

An unnamed female Sri Lankan baby leopard (Panthera pardus kotiya) is seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopard, reported as an endangered animal species by the International Union for Conservation of Nature, was born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS ENVIRONMENT SOCIETY) 

An unnamed female Sri Lankan baby leopard (Panthera pardus kotiya) is seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopard, reported as an endangered animal species by the International Union for Conservation of Nature, was born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS ENVIRONMENT SOCIETY) 

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. REUTERS/Yves Herman (FRANCE - Tags: ANIMALS TPX IMAGES OF THE DAY SOCIETY) 

Thierry Petit (R), zoo veterinarian, operates on a Sri Lankan leopard at the family-owned Palmyre Zoo in the 18 hectares (44 acres) pine forest of Les Mathes, in the Charente Maritime region, western France, November 20, 2013. The private zoo which opened in 1966 greets up to 800,000 visitors a year and is home to around 1,700 animals of 170 different species. Zoo keepers annually nourish the animals with 250 tons of fodder, 50 tons of meat, 20 tons of fish, 180 tons of fresh fruit and vegetables. Two full-time veterinarians are in charge of the health and well-being of the animals. The Palmyre Zoo participates in 40 European breeding programmes and provides funding for the conservation of endangered species. Picture taken November 20, 2013. REUTERS/Regis Duvignau (FRANCE - Tags: ANIMALS SOCIETY) 

Sariska, mother of two newborn Sri Lankan leopard (Panthera pardus kotiya) cubs, picks up one of her cubs during a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Her two 5-weeks-old cubs, Nanyana and her sister Nimali, were presented to the media for the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

Nimali, a 5-week-old Sri Lankan leopard (Panthera pardus kotiya) cub, receives a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Nimali and her sister Nanyana were presented to the media dor the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

Nayana, a 5-week-old Sri Lankan leopard (Panthera pardus kotiya) cub, receives a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Nanyana and her sister Nimali were presented to the media for the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

Nayana, a 5-week-old Sri Lankan leopard (Panthera pardus kotiya) cub, receives a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Nanyana and her sister Nimali were presented to the media for the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

Nayana, a 5-week-old Sri Lankan leopard (Panthera pardus kotiya) cub, looks out of a pail as she is being weighed during a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Nanyana and her sister Nimali were presented to the media for the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

Nayana, a 5-week-old Sri Lankan leopard (Panthera pardus kotiya) cub, receives a medical examination by veterinary surgeons at Bratislava Zoo July 28, 2011. Nanyana and her sister Nimali were presented to the media for the first time on Thursday. REUTERS/Radovan Stoklasa (SLOVAKIA - Tags: ANIMALS) 

A two-month-old female Sri Lanka leopard is seen at Fuengirola's zoo, southern Spain, August 11, 2007. The feline, which is in danger of extinction, is the first leopard born in captivity in Spain. REUTERS/Jon Nazca (SPAIN) 

A two-month-old female Sri Lanka leopard hangs from a tree at Fuengirola's zoo, southern Spain, August 11, 2007. It is the first leopard born in captivity in Spain. REUTERS/Jon Nazca (SPAIN) 

A two-month-old female Sri Lanka leopard is seen at Fuengirola's zoo, southern Spain, August 11, 2007. It is the first leopard born in captivity in Spain. REUTERS/Jon Nazca (SPAIN)