The Sydney Harbour Bridge can be seen behind a visitor to a preview of Taronga Zoo's illuminated endangered animal sculptures walking past the Tasmanian Devil display, which is part of Vivid Sydney Festival of Light and Sound which will begin on May 26 with many of Sydney's landmarks participating in the annual event, in Sydney, Australia, May 21, 2017. REUTERS/David Gray 

Devil Ark operations manager Mike Drinkwater waves off a chartered aircraft carrying a shipment of healthy and genetically diverse Tasmanian Devils to the island state of Tasmania, from Scone Airport on Australia's mainland, November 18, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 18. REUTERS/Jason Reed

A Tasmanian Devil is loaded by Devil Ark manager Dean Reid onto a chartered aircraft as part of a shipment of healthy and genetically diverse devils to the island state of Tasmania, from Scone Airport on Australia's mainland, November 18, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 18. REUTERS/Jason Reed

A Tasmanian Devil fights off another devil as he eats kangaroo meat before a first shipment of healthy and genetically diverse devils is sent to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Tasmanian Devils fight in their enclosure before the first shipment of healthy and genetically diverse devils to the island state of Tasmania are sent from the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil joey sits on the shoulder of Devil Ark manager Dean Reid as he prepares a shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Devil Ark manager Dean Reid walks with a pair of Tasmanian Devils joeys on his shoulders before the first shipment of healthy and genetically diverse devils to the island state of Tasmania leave the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil eats kangaroo meat before the first shipment of healthy and genetically diverse devils are sent to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Devil Ark operations manager Mike Drinkwater (C) points to the sky as a chartered flight carrying a shipment of healthy and genetically diverse Tasmanian Devils takes off to the island state of Tasmania from Scone Airport near the Devil Ark sanctuary on Australia's mainland, November 18, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 18. REUTERS/Jason Reed

A Tasmanian Devil joey sits on the shoulder of Devil Ark manager Dean Reid as he prepares a shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A trap containing a Tasmanian Devil named Cameron is prepared as part of a shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 18, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 18. REUTERS/Jason Reed

Tasmanian Devils are strapped in their traps onto a truck bed during a shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 18, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 18. REUTERS/Jason Reed

A Tasmanian Devil sits among tall grass as a shipment of healthy and genetically diverse devils to the island state of Tasmania are prepared, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil named Irene has her paws sprayed with disinfectant by operations manager Mike Drinkwater as she is prepared for the first shipment of healthy and genetically diverse devils to the island state of Tasmania, from the Devil Ark recovery and breeding facility in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil named Irene has her paws sprayed with disinfectant by operations manager Mike Drinkwater as she is prepared as part of a shipment of healthy and genetically diverse devils to the island state of Tasmania, from the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Tasmanian Devils fight over a piece of kangaroo meat during feeding time at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Devil Ark operations manager Mike Drinkwater inspects Irene, a Tasmanian Devil, as she is prepared as part of a shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil screeches in its enclosure before being shipped as part of a healthy and genetically diverse group to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

A Tasmanian Devil is inspected in its trap as its prepared for the first shipment of healthy and genetically diverse devils to the island state of Tasmania, at the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed

Devil Ark manager Dean Reid reacts as Tasmanian Devil joeys climb on him before the first shipment of healthy and genetically diverse devils to the island state of Tasmania leave the Devil Ark sanctuary in Barrington Tops on Australia's mainland, November 17, 2015. The largest group so far of disease-free Tasmanian devils has been released in the wild, as part of plans to save the carnivorous marsupials from a cancer threatening them with extinction. Picture taken November 17. REUTERS/Jason Reed TPX IMAGES OF THE DAY

A Tasmanian Devil looks out at its new enclosure at Wild Life Zoo in central Sydney December 21, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS SOCIETY) 

A Tasmanian Devil opens its mouth at its new enclosure at Wild Life Zoo in central Sydney December 21, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS SOCIETY) 

A Tasmanian Devil eats the head of a small chicken at its new enclosure at Wild Life Zoo in central Sydney December 21, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS SOCIETY) 

A visitor pets a baby Tasmanian devil during a National Threatened Species Day event, held in central Sydney September 7, 2012. The National Threatened Species Day is an event organised by the Zoo and Aquarium Association to educate local communities about the importance of threatened species and what people can do to help them, according to the organisers. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS) 

A Tasmanian devil walks next to a Christmas treat left by zookeepeers inside its enclosure at Taronga zoo in Sydney December 21, 2011. REUTERS/Daniel Munoz (AUSTRALIA - Tags: ANIMALS RELIGION SOCIETY) 

A Tasmanian Devil stands on a rock in a new breeding centre at Sydney's Taronga Zoo June 30, 2010. The zoo has developed the Tasmanian Devil breeding centre to assist preservation of the carnivorous marsupial from Devil Facial Tumour Disease which has decimated wild populations over the last decade. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ANIMALS ENVIRONMENT SOCIETY) 

A pair of Tasmanian Devils tussles for a piece of rabbit in a new breeding centre at Sydney's Taronga Zoo June 30, 2010. The zoo has developed a the Tasmanian Devil breeding centre to assist preservation of the carnivorous marsupial from Devil Facial Tumour Disease which has decimated wild populations over the last decade. REUTERS/Tim Wimborne (AUSTRALIA - Tags: SOCIETY ENVIRONMENT ANIMALS) 

A pair of Tasmanian Devils tussles for a piece of rabbit in a new breeding centre at Sydney's Taronga Zoo June 30, 2010. The zoo has developed a the Tasmanian Devil breeding centre to assist preservation of the carnivorous marsupial from Devil Facial Tumour Disease which has decimated wild populations over the last decade. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ANIMALS ENVIRONMENT SOCIETY) 

A Tasmanian Devil tears pieces of rabbit in a new breeding centre at Sydney's Taronga Zoo June 30, 2010. The zoo has developed the Tasmanian Devil breeding centre to assist preservation of the carnivorous marsupial from Devil Facial Tumour Disease which has decimated wild populations over the last decade. REUTERS/Tim Wimborne (AUSTRALIA - Tags: SOCIETY ENVIRONMENT ANIMALS) 

A pair of Tasmanian Devils tussles for a piece of rabbit in a new breeding centre at Sydney's Taronga Zoo June 30, 2010. The zoo has developed the Tasmanian Devil breeding centre to assist preservation of the carnivorous marsupial from Devil Facial Tumour Disease which has decimated wild populations over the last decade. REUTERS/Tim Wimborne (AUSTRALIA - Tags: SOCIETY IMAGES OF THE DAY ANIMALS) 

An unnamed male Tasmanian Devil cub receives a health check in his enclosure at Sydney's Taronga Zoo, October 22, 2009. Four six months old Tasmanian Devil cubs are having health checks and paternity test to avoid their extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Daniel Munoz (AUSTRALIA ANIMALS ENVIRONMENT SOCIETY) 

An unnamed male Tasmanian Devil cub receives a health check from Senior Veterinarian Larry Vogelnest (R) and zookeeper Tony Britt-Lewis at Sydney's Taronga Zoo October 22, 2009. Four six months old Tasmanian Devil cubs are having health checks and paternity test to avoid their extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Daniel Munoz (AUSTRALIA ANIMALS ENVIRONMENT) 

An unnamed male Tasmanian Devil cub receives a health check in his enclosure at Sydney's Taronga Zoo October 22, 2009. Four six months old Tasmanian Devil cubs are having health checks and paternity test to avoid their extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Daniel Munoz (AUSTRALIA ANIMALS ENVIRONMENT) 

An adult male Tasmanian Devil named Tex stretches his jaws open in his enclosure at Sydney's Taronga Zoo October 17, 2008. Taronga Zoo announced a new fundraising campaign for the Tasmanian Devil breeding program on Friday, as authorities campaign to save the world's largest carnivorous marsupial from extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Tim Wimborne (AUSTRALIA) 

An adult male Tasmanian Devil named Tex eats a rabbit carcass in his enclosure at Sydney's Taronga Zoo October 17, 2008. Taronga Zoo announced a new fundraising campaign for the Tasmanian Devil breeding program on Friday, as authorities campaign to save the world's largest carnivorous marsupial from extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Tim Wimborne (AUSTRALIA) 

An adult male Tasmanian Devil named Tex looks out from behind a log in his enclosure at Sydney's Taronga Zoo October 17, 2008. Taronga Zoo announced a new fundraising campaign for the Tasmanian Devil breeding program on Friday, as authorities campaign to save the world's largest carnivorous marsupial from extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Tim Wimborne (AUSTRALIA) 

An adult male Tasmanian Devil named Tex eats a rabbit carcass in his enclosure at Sydney's Taronga Zoo October 17, 2008. Taronga Zoo announced a new fundraising campaign for the Tasmanian Devil breeding program on Friday, as authorities campaign to save the world's largest carnivorous marsupial from extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Tim Wimborne (AUSTRALIA) 

An adult male Tasmanian Devil named Tex stretches his jaws open in his enclosure at Sydney's Taronga Zoo October 17, 2008. Taronga Zoo announced a new fundraising campaign for the Tasmanian Devil breeding program on Friday, as authorities campaign to save the world's largest carnivorous marsupial from extinction from a rare transmission cancer called Devil Facial Tumour Disease. REUTERS/Tim Wimborne (AUSTRALIA)