Mohammad, a 13-year-old fighter from the “Free Syrian Army”, plays with a cat in Aleppo's Bustan al-Basha district, Syria October 28, 2013. Mohammad joined the Free Syrian Army after his father died during clashes with the Syrian regime. The gun he is using was his father's. (Photo by Molhem Barakat/Reuters)

In this Friday, December 4, 2018 photo, a half sunken cruise ship lays on its side, in the Gulf of Elefsina, west of Athens. Dozens of abandoned cargo and passenger ships lie semi-submerged or completely sunken around the Gulf of Elefsina, near Greece’s major port of Piraeus. Now authorities are beginning to remove the dilapidated ships. Some of them have been there for decades, leaking hazards like oil into the environment and creating a danger to modern shipping. One expert calls the abandoned ships “an environmental bomb”. (Photo by Thanassis Stavrakis/AP Photo)

Hundreds of gannets dive for mackerel off the coast of Shetland, Northern Isles of Scotland on July 2020, where they plunge into the water from heights of up to 100ft at speeds of 60mph. (Photo by David Keep/The Times)

A fight between two female musk oxen, Norway, 2021. The image was captured in Norway’s Dovrefjell national park, where the musk ox (Ovibos moschatus) was reintroduced several years ago for its conservation. It is normal for males of this species to engage in fierce battles during the mating season but unusual for two females. (Photo by Miquel Angel Artús Illana)

A member of the public places her head in Drew McDonald's sculpture Sharnana, during the Sculpture by the Sea media launch event along the Bondi to Tamarama Coastal walk in Sydney, Australia, 18 October 2024. (Photo by Bianca de Marchi/EPA/EFE)

Dogs Lucy and Larry await the arrival of Britain's King Charles III and Queen Camilla at Sydney Opera House in Sydney, Australia, 22 October 2024. King Charles III and Queen Camilla are visiting Australia from 18 October to 23 October. (Photo by Bianca de Marchi/EPA)

Jason Garcia poses as The Joker from Batman at the 2015 Comic-Con International in San Diego, California, July 9, 2015. (Photo by Sandy Huffaker/Reuters)

Among the fish populations that could be harmed by the Xayaburi dam in Laos is the critically endangered Mekong giant catfish, considered by the Guinness Book of World Records to be the world’s largest freshwater fish. The fish, which grows to 650 pounds and about 10 feet long, is only found in the Mekong River. It is migratory, moving between downstream habitats in Cambodia upstream to northern Thailand and Laos each year to spawn. Some experts fear the Xayaburi dam could block the migration and drive the giant catfish to extinction. (Photo by Courtesy of Zeb Hogan/University of Nevada, Reno)