Icelandic horses play on a stud farm in Wehrheim Frankfurt, Germany, as the sun rises on Thursday, May 21, 2020. (Photo by Michael Probst/AP Photo)

Fans are seen at the 143rd Kentucky Derby on May 6, 2017 in Louisville, Kentucky. (Photo by Michael Hickey/Getty Images)

Icelandic horses play on a meadow in Wehrheim near Frankfurt, Germany, as the sun rises on Tuesday, May 28, 2024. (Photo by Michael Probst/AP Photo)

Two storks sit in their nest as the sun rises in Wehrheim near Frankfurt, Germany, Thursday, August 29, 2024. (Photo by Michael Probst/AP Photo)

A greyhound dog dressed up in a festive costume on Buchanan Street in Glasgow on December 24, 2023. (Photo by Michael McGurk/Rex Features/Shutterstock)

Fisherman transport sharks to the fish market in the traditional fishing port in Banda Aceh, Indonesia, 26 August 2020. According to media reports, the marine and fisheries sector is considered as one of the affected by the coronavirus pandemic, affecting more than 3.5 million fishermen and all sectors working throughout the supply chain. (Photo by Hotli Simanjuntak/EPA/EFE)

Fishermen catch fish at Mao'er lake at the start of winter fishing season which is a local custom to welcome the new year on December 29, 2018 in Huaian, Jiangsu Province of China. (Photo by VCG/VCG via Getty Images)

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)