Zoo keepers Joe Capon (R) and Charli Ellis encourage a Galapagos giant tortoise to stand on weighing scales at ZSL London Zoo 2020 weigh-in and measurement, in London, Britain, August 27, 2020. REUTERS/Toby Melville

A zookeeper carries a cake made of vegetables to celebrate the 100th birthday of Tuki, an Aldabra Giant tortoise, at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, and an African spurred tortoise eat a cake made of vegetables to celebrate Tuki's 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Zookeepers prepare a cake with vegetables to celebrate the 100th birthday of Tuki, an Aldabra Giant tortoise, at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables, as llamas watch, to celebrate his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables, as llamas watch, to celebrate his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables, as llamas watch, to celebrate his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables, as llamas watch, to celebrate his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, and an African spurred tortoise eat a cake made of vegetables to celebrate Tuki's 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, is washed by a zookeeper, as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, eats a cake made of vegetables as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

Tuki, an Aldabra Giant tortoise, is washed by a zookeeper, as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Tuki, an Aldabra Giant tortoise, is washed by a zookeeper, as he celebrates his 100th birthday at Faruk Yalcin Zoo, amid the spread of the coronavirus disease (COVID-19) in Darica, 60 kilometers east of Istanbul, Turkey, April 30, 2020. REUTERS/Umit Bektas

Aldabra giant tortoises eat carrots at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

An Aldabra giant tortoise looks at visitors at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Aldabra giant tortoises eat carrots at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

An Aldabra giant tortoise looks at visitors at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Aldabra giant tortoises are pictured at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Two Aldabra giant tortoises mate at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

An Aldabra giant tortoise looks at visitors at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

A giant tortoise is seen in a roof garden in Hong Kong, China, July 2, 2019. REUTERS/Jorge Silva

A giant tortoise is seen at Africano animals park, along the Cairo-Alexandria desert road, Egypt June 7, 2017. REUTERS/Amr Abdallah Dalsh

A giant tortoise is seen at the Africano animals park, along the Cairo-Alexandria desert road, Egypt June 7, 2017. REUTERS/Amr Abdallah Dalsh

A giant tortoise is seen at the Africano animals park, along the Cairo-Alexandria desert road, Egypt June 7, 2017. REUTERS/Amr Abdallah Dalsh

Giant tortoises are seen in Floreana Island at Galapagos National Park, Ecuador, October 8, 2016. Picture taken October 8, 2016. REUTERS/Nacho Doce

Giant tortoises are seen in Floreana Island at Galapagos National Park, Ecuador, October 8, 2016. Picture taken October 8, 2016. REUTERS/Nacho Doce

A young Galapagos giant tortoise (Chelonoidis nigra) is seen together with its mother Nigrita (back) and father Jumbo (R) at an enclosure at the zoo in Zurich December 17, 2014. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: ANIMALS ENVIRONMENT)

Galapagos giant tortoise (Chelonoidis nigra) is seen at an enclosure at the zoo in Zurich December 17, 2014. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: ANIMALS ENVIRONMENT)

A Seychelles giant tortoise is fed by a zoo employee 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)

A giant tortoise is seen on a road at Santa Cruz island at Galapagos National Park August 23, 2013. Picture taken August 23, 2013. REUTERS/Jorge Silva (ECUADOR - Tags: ENVIRONMENT SOCIETY TRAVEL ANIMALS)

An Aldabra giant tortoise feasts on food treats at the Taronga Zoo in Sydney December 14, 2012. Animals at the Taronga Zoo were given food treats as part of their Christmas celebrations. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS SOCIETY)

A Galapagos giant tortoise is pictured during its annual weighing at Riga Zoo July 12, 2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS)

Two Galapagos giant tortoises gather during their annual weighing at Riga Zoo July 12,2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS)

Former Latvia's Olympic team flag-bearers Raimonds Bergmanis (L) and Voldemars Lusis lift a 109 kg (240,30 lb) Galapagos giant tortoise during its annual weighing at Riga Zoo July 12,2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS SPORT)

Former Latvia's Olympic team flag-bearers Raimonds Bergmanis (R) and Voldemars Lusis lift a 109 kg (240,30 lb) Galapagos giant tortoise during its annual weighing at Riga Zoo July 12,2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS SPORT)

Former Latvia's Olympic team flag-bearers Raimonds Bergmanis (R) and Voldemars Lusis lift a 109 kg (240,30 lb) Galapagos giant tortoise during its annual weighing at Riga Zoo July 12,2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS SPORT OLYMPICS)

A photographer takes a picture of the two Galapagos giant tortoises during their annual weighing at Riga Zoo July 12,2012. REUTERS/Ints Kalnins (LATVIA - Tags: SOCIETY ANIMALS)

Tourists feed the Aldabra a giant tortoise at the Singapore Zoo September 6, 2011. The Aldabra giant tortoise, from the islands of the Aldabra Atoll in the Seychelles, are the second largest species of tortoises on Earth and can weigh more than five times the weight of an average human being, according to the Zoo. REUTERS/David Loh (SINGAPORE - Tags: ENVIRONMENT ANIMALS)

Two Aldabra giant tortoises fight for a carrot during feeding time at the Singapore Zoo September 6, 2011. The Aldabra giant tortoise, from the islands of the Aldabra Atoll in the Seychelles, are the second largest species of tortoises on Earth and can weigh more than five times the weight of an average human being, according to the Singapore Zoo. REUTERS/David Loh (SINGAPORE - Tags: ENVIRONMENT ANIMALS TPX IMAGES OF THE DAY)

Dirk the giant Galapagos tortoise clambers on top of his younger co-resident Dolly in their enclosure at London Zoo, August 25, 2011. REUTERS/Andrew Winning (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT)

Dirk the giant Galapagos tortoise is distracted with a ball by his keeper Sebastian Grant, as he stands on a scale to weigh him during a photocall to publicize the annual measuring of all the animals at London Zoo, in central London, August 25, 2011. REUTERS/Andrew Winning (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT IMAGES OF THE DAY)

Dirk the giant Galapagos tortoise clambers on top of his younger co-resident Dolly in their enclosure at London Zoo, August 25, 2011. REUTERS/Andrew Winning (BRITAIN - Tags: SOCIETY ENVIRONMENT ANIMALS IMAGES OF THE DAY)

A zookeeper lures an Aldabra giant tortoise onto a scale at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

A zookeeper lures an Aldabra giant tortoise onto a scale at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

Two Aldabra giant tortoises mate at the Artis Zoo in Amsterdam August 10, 2011. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

Two Aldabra giant tortoises mate at the Artis Zoo in Amsterdam August 10, 2011. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY IMAGES OF THE DAY)

An Aldabra giant tortoise walks toward the camera as two others are weighed on a scale at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

A zookeeper lures an Aldabra giant tortoise onto a scale at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

A zookeeper weighs an Aldabra giant tortoise at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

Two Aldabra giant tortoises mate at the Artis Zoo in Amsterdam August 10, 2011. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY IMAGES OF THE DAY)

A zookeeper weighs an Aldabra giant tortoise at the Artis Zoo in Amsterdam August 10, 2011. The tortoises are weighed every two years to check their health. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY)

Britain's Prince William, Duke of Cambridge, builds separate parts of a giant tortoise with students Blanca Rodriguez (C) and Elliana Rojas during his visit with Catherine, Duchess of Cambridge, at the Inner-City Arts campus in Los Angeles, California, July 10, 2011. Prince William and his wife Catherine are on a royal visit to California from July 8 to July 10. REUTERS/Kevork Djansezian/Pool (UNITED STATES - Tags: POLITICS ROYALS EDUCATION)

GALAPAGOS TORTOISE/ - Map showing the home ground of Lonesome George, a Galapagos giant tortoise found in Pinta Island. Previously transmitted on 18/09/2008

GALAPAGOS TORTOISE/ - Map showing the home ground of Lonesome George, a Galapagos giant tortoise found in Pinta Island. Previously transmitted on 18/09/2008

Zoo keeper Sebastian Grant makes a record of a giant Galapagos tortoise named Dirk at London Zoo during the annual head count January 5, 2010. More than 750 different species were tallied up in the head count of every animal. REUTERS/Kevin Coombs (BRITAIN - Tags: ANIMALS SOCIETY)

Britain's Prince Charles (L), joined by his wife Camilla Duchess of Cornwall (2nd L), watches giant tortoises at the Charles Darwin National Park in the Galapagos Islands in Ecuador during his Latin American tour March 16, 2009. Prince Charles is in Ecuador on an official visit. REUTERS/Guillermo Granja (ECUADOR POLITICS TRAVEL ROYALS)

Tourists walk towards Pinta island tortoise "Lonesome George's" shelter at Galapagos National Park in Santa Cruz September 15, 2008. After decades of solitude, "Lonesome George" may finally save his species of Galapagos giant tortoise from extinction, his keepers said in July. George, who has shown little interest in reproducing during 36 years in captivity, stunned his keepers by mating with one of his two female companions of a similar species of Galapagos tortoise. Park rangers found a nest with several eggs in George's pen and placed three in incubators. It will take about four months to know whether the eggs bear George's offspring. REUTERS/Guillermo Granja (Ecuador)