Global wildlife populations will decline by 67% by 2020 unless urgent action is taken to reduce human impact on species and ecosystems, warns the biennial Living Planet Index report from WWF (World Wide Fund for Nature) and ZSL (Zoological Society of London). From elephants to eels, here are some of the wildlife populations most affected by human activity. Here: The maned wolf is among the large mammals in the Brazilian Cerrado that are threatened by the increasing conversion of grasslands into farmland for grazing and growing crops. (Photo by Ben Cranke/Nature Picture Library/Alamy Stock Photo)

Russian artist Maria Gazanova (L) works on her "The Alive Painting" art work during the Art Krasnoyarsk annual festival in Siberian city of Krasnoyarsk, Russia November 4, 2015. (Photo by Ilya Naymushin/Reuters)

A woman whose family members are trapped under rubble wails after a landslide washed away houses in Raigad district, western Maharashtra state, India, Thursday, July 20, 2023. While some people are reported dead many others feared trapped under piles of debris. (Photo by Rafiq Maqbool/AP Photo)

Four-year-old Riley Gillet, of Orlando, lights a candle with her family, marking the beginning of the traditional Jewish holiday of Hanukkah, during the Chabad of Greater Orlando's “Chanukah on the Park” celebration in Winter Park, Fla., late Sunday, November 28, 2021. Held at Central Park, the event included the lighting of a giant menorah, live performers, music and dancing. Jews worldwide will celebrate Hanukkah through Dec. 6. (Photo by Joe Burbank/Orlando Sentinel via AP Photo)

Actor Gal Gadot poses with her family during the unveiling ceremony for her star on the Hollywood Walk of Fame in Los Angeles on March 18, 2025. (Photo by Mario Anzuoni/Reuters)

India's Railway Protection Force (RPF) personnel assists a dog to perform a stunt during the celebrations to mark country's Independence Day, in Chennai on August 15, 2025. (Photo by R.Satish Babu/AFP Photo)

British designer Kim Jones (C) walks the runway to greet the audience after the show of the Spring/Summer 2025 Menswear Collection for Dior fashion house during the Paris Fashion Week, in Paris, France, 21 June 2024. The presentation of the Men's collections runs from 18 to 23 June. (Photo by Andre Pain/EPA/EFE)

Farmers feed crabs under Metasequoia at the Sihong County Ecological Breeding Base in Suqian City, Jiangsu Province, China, on November 19, 2025. (Photo by Costfoto/NurPhoto/Rex Features/Shutterstock)