A veterinary surgeon treats a wound of the 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A mahout walks with the 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, after a bath, as he receives medical help, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A veterinary surgeon treats a wound of the 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A medical officer holds the medicine for the 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, walks with his injured left leg after a bath, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, rests in water while receiving medical help, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, eats his vitamins, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A general view shows a special cage built for the 29-year-old elephant named Sak Surin, an ailing male Thai elephant, which was gifted to Sri Lanka by the Thai government in 2001, before his departure back to Thailand for treatment and rehabilitation, at Dehiwala Zoological Garden in Colombo, Sri Lanka June 20, 2023. REUTERS/Dinuka Liyanawatte 

A three-month-old Bengali tiger cub is seen inside a box after the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Three-month-old Bengali tiger cubs are seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

A three-month-old Bengali tiger cub is seen inside a box after the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte TPX IMAGES OF THE DAY 

Three-month-old Bengali tiger cubs are seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Three-month-old Bengali tiger cubs are seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

A three-month-old Bengali tiger cub is seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Three-month-old Bengali tiger cubs are seen inside a box after the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Three-month-old Bengali tiger cubs are seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Three-month-old Bengali tiger cubs are seen during the first time public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

A man carries a three-month-old Bengali tiger cub for the first time in public sighting at the Dehiwala Zoological Garden, in Colombo, Sri Lanka, June 2, 2022. REUTERS/Dinuka Liyanawatte 

Souvenir shop staff wearing protective masks, amid the coronavirus disease (COVID-19) outbreak, stand behind plastic panels on reception desk, which were installed to prevent infection, during a public viewing event for the twin giant panda cubs "Lei Lei" and "Xiao Xiao" born last June at Ueno Zoological Gardens in Tokyo, Japan January 12, 2022. REUTERS/Kim Kyung-Hoon 

Staff wearing protective masks, amid the coronavirus disease (COVID-19) outbreak, guide visitors during a public viewing event for the twin giant panda cubs "Lei Lei" and "Xiao Xiao" born last June at Ueno Zoological Gardens in Tokyo, Japan January 12, 2022. REUTERS/Kim Kyung-Hoon 

Capybaras sit inside a hot tub full of apples at Izu Shaboten Zoo in Ito, Japan February 1, 2020. Picture taken February 1, 2020. REUTERS/Sakura Murakami 

Panda twin cubs Paule (Meng Yuan) and Pit (Meng Xiang) and mother panda Meng Meng are seen during their first appearance in their enclosure at the Berlin Zoo in Berlin, Germany January 29, 2020. REUTERS/Fabrizio Bensch REFILE - CORRECTING YEAR 

A bearded vulture is pictured at the Sanaa Zoo, Yemen January 20, 2020. Picture taken January 20, 2020. REUTERS/Mohamed al-Sayaghi 

A newborn chimpanzee baby holds its mother's toe with the mouth at the Sao Paulo Zoo, in Sao Paulo, Brazil, January 17, 2020. REUTERS/Rahel Patrasso TPX IMAGES OF THE DAY 

The chimpanzee "Tina" holds its newborn baby at Sao Paulo Zoo in Sao Paulo, Brazil, January, 17, 2020. REUTERS/Rahel Patrasso 

A baby giraffe is pictured at its enclosure at the Chapultepec zoo in Mexico City, Mexico January 10, 2020. REUTERS/Luis Cortes 

A baby giraffe is pictured at its enclosure at the Chapultepec zoo in Mexico City, Mexico January 10, 2020. REUTERS/Luis Cortes 

A baby giraffe is pictured next to his mother at their enclosure at the Chapultepec zoo in Mexico City, Mexico January 10, 2020. REUTERS/Luis Cortes 

A baby giraffe is pictured at its enclosure at the Chapultepec zoo in Mexico City, Mexico January 10, 2020. REUTERS/Luis Cortes 

A baby giraffe is pictured at its enclosure at the Chapultepec zoo in Mexico City, Mexico January 10, 2020. REUTERS/Luis Cortes 

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, opens its mouth at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, is fed at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, shakes its head at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

A zookeeper sprays water on an elephant in an enclosure at Zoological Garden during hot and humid weather in Karachi, Pakistan June 25, 2019. REUTERS/Akhtar Soomro 

Zoo staff gather as a female elephant named Noor Jahan eats cake on the occassion of her 14th birthday celebration at the Zoological Garden in Karachi, Pakistan October 4, 2018. REUTERS/Akhtar Soomro TPX IMAGES OF THE DAY 

Zoo keepers apply coconut oil to a female elephant named Noor Jahan on the occassion of her 14th birthday celebration at the Zoological Garden in Karachi, Pakistan October 4, 2018. REUTERS/Akhtar Soomro 

Zoo staff gather as a female elephant named Noor Jahan eats cake on the occassion of her 14th birthday celebration at the Zoological Garden in Karachi, Pakistan October 4, 2018. REUTERS/Akhtar Soomro 

Zoo keepers give a bath to an elephant at the enclosure in Zoological Garden, during hot and humid weather in Karachi, Pakistan May 30, 2018. REUTERS/Akhtar Soomro 

A Buddhist monk blesses an elephant during the ritualistic ceremony of anointing oil as a part of Sri Lanka's Sinhala, Hindu and Tamil new year at the National Zoological Gardens in Colombo, Sri Lanka April 16, 2018. REUTERS/Dinuka Liyanawatte 

A Buddhist monk blesses an elephant during the ritualistic ceremony of anointing oil as a part of Sri Lanka's Sinhala, Hindu and Tamil new year at the National Zoological Gardens in Colombo, Sri Lanka April 16, 2018. REUTERS/Dinuka Liyanawatte 

An elephant plays basketball during a show at the national zoological gardens in Colombo, Sri Lanka March 21,2018.REUTERS/ Dinuka Liyanawatte 

A man smokes a cigarette as he sits on a side wall of the Beaumont Lawns, named after the late T.L.F. Beaumont Esq, who was President of Karachi Municipality and Chairman of the Garden Committee during the British Raj era, at a zoological garden in Karachi, Pakistan February 10, 2018. REUTERS/Akhtar Soomro 

Visitors wait to watch female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, at the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Panda enthusiast Saeko Nishitani, 23, poses for a photograph after watching the public viewing of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. Placard reads, 'Take me to the public viewing of the panda Xiang Xiang'. REUTERS/Issei Kato 

A staff member of the zoo prepares for public debut of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, at the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Panda enthusiast Saeko Nishitani, 23, poses for a photograph after the public viewing of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Panda enthusiast Saeko Nishitani, 23, poses for a photograph after the public viewing of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Rental baby buggies featuring giant panda are seen at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Panda enthusiast Saeko Nishitani, 23, poses for a photograph after the public viewing of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

A staff member of the zoo tries to control visitors before starting the public debut of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, at the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Visitors carrying a daypack featuring giant panda wait for the public debut of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, at the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Visitors holding bags featuring giant panda wait for starting the public debut of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

Visitors wait to watch female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

6-month-old baby Miu Suwazono wearing a costume featuring giant panda waits for starting the public debut of female baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, on the first day of her public debut at Ueno Zoological Gardens in Tokyo, Japan December 19, 2017. REUTERS/Issei Kato 

A baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, plays on the ground during a press preview ahead of the public debut at Ueno Zoological Gardens in Tokyo, Japan December 18, 2017. REUTERS/Yoshikazu Tsuno/Pool 

A baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, walks on the ground during a press preview ahead of the public debut at Ueno Zoological Gardens in Tokyo, Japan December 18, 2017. REUTERS/Yoshikazu Tsuno/Pool 

A baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, eats bamboo during a press preview ahead of the public debut at Ueno Zoological Gardens in Tokyo, Japan December 18, 2017. REUTERS/Yoshikazu Tsuno/Pool 

A baby panda Xiang Xiang, born from mother panda Shin Shin on June 12, 2017, climbs a tree during a press preview ahead of the public debut at Ueno Zoological Gardens in Tokyo, Japan December 18, 2017. REUTERS/Yoshikazu Tsuno/Pool