Vultures gather to eat waste in Bica beach, on the banks of the Guanabara Bay, with the Sugar Loaf mountain in background, 500 days ahead the Rio 2016 Olympic Games in Rio de Janeiro March 24, 2015. As part of its Olympic bid, Rio promised to clean up 80 percent of the bay for the games. But local government officials have already admitted that a cleanup by 2016 is not achievable. Despite millions of dollars of investment over the years, the bay still stinks of sewage. Sailors who visited the city for test events complained of a floating sofa and a dead dog in the water. (Photo by Ricardo Moraes/Reuters)

The National Geographic Photo Ark is a travelling exhibition of photographer Joel Sartore’s quest to create a photo archive of biodiversity around the world. So far, Sartore has captured studio portraits of more than 6,000 species – a number that he hopes to double. On 1 July, the ark will open at Melbourne zoo – the first time it has been exhibited in the southern hemisphere. More than 50 portraits will be on display, including many of Australian endangered animals being protected by programs at the zoo itself. These captions have been edited from text supplied by Melbourne zoo. Here: Barking owl. (Photo by Joel Sartore/National Geographic Photo Ark/The Guardian)

A truffle is seen on a table in Alba, north-western Italy November 11, 2013. Located in the heart of the Langhe – the hilly southern area of Italy's northwestern Piedmont region – Alba is the country's capital of white truffles, a variety of the prized fungus which grows underground. Truffles are found two to eight inches (5-20cm) below the ground near the roots of trees. They give off an odour which lasts for a limited period of time and can be detected with the assistance of well-trained dogs and experienced hunters. Output of white truffles, which are not cultivated and only grow naturally in forests, has fallen in Italy over the past few years, largely because climate change has brought a damaging mix of drought and torrential rains. (Photo by Stefano Rellandini/Reuters)

A baby bush-baby in a set of scales at London Zoo shortly after birth. (Photo by Fox Photos/Getty Images). 10th August 1938

A volunteer feeds a swift chick after it was found on the ground during a heatwave and given to the Centre Ornithologique de Readaptation in Genthod near Geneva, Switzerland on July 25, 2023. (Photo by Denis Balibouse/Reuters)

Costumed pigs jump over a brush head while training for a forthcoming race at Monk Park Farm, Thirsk, North Yorkshire, United Kingdom on April 24, 2023. (Photo by James Glossop/The Times)

Relatives of inmates of the «Santiago 1» jail react outside the prison after a large number of prisoners attempted to escape amid panic over the spread of the COVID-19 coronavirus in Santiago, Chile, on March 19, 2020. (Photo by Javier Torres/AFP Photo)

Two orphaned wallaby joeys enjoy a play date to help them boost their social skills in Australia early July 2023. The rescued joeys are being hand-raised at Aussie Ark in News South Wales. (Photo by Aussie Ark/Cover Images)