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)

A member of the Gumatj clan performs a ceremonial welcome during the Garma Festival at the Gulkula ceremonial in the Gove Peninsula of the Northern Territory, Australia 03 August 2024. The Garma Festival is Australia’s largest Indigenous gathering, a 4-day celebration of Yolngu life and culture held in remote northeast Arnhem Land. (Photo by Mick Tsikas/EPA)

People walk on the Patriarch's bridge decorated for Christmas and New Year celebrations with the Christ the Savior Cathedral in the background in Moscow, Russia, Monday, December 16, 2019. (Photo by Alexander Zemlianichenko/AP Photo)

People walk along the Neva River at sunset in St.Petersburg, Russia, Tuesday, December 6, 2016. The temperature in St.Petersburg is –9C ( 15.8 °F). (Photo by Dmitri Lovetsky/AP Photo)

Miss Japan, Juri Watanabe, appears on stage during the national costume presentation of the 70th Miss Universe beauty pageant in Israel's southern Red Sea coastal city of Eilat on December 10, 2021. (Photo by Menahem Kahana/AFP Photo)

Yuliya Levchenko, of Ukraine, celebrates during qualifying for the women's high jump at the World Athletics Championships on Saturday, July 16, 2022, in Eugene, Ore. (Photo by Ashley Landis/AP Photo)

Brazilian singer Larissa de Macedo Machado, better known by her stage name Anitta performs during the Coachella Valley Music and Arts Festival at the Empire Polo Club in Indio, California, U.S., April 22, 2022. (Photo by Maria Alejandra Cardona/Reuters)

A Brazil fan waits for the start of the group A World Cup soccer match between Brazil and Croatia, the opening game of the tournament, in the Itaquerao Stadium in Sao Paulo, Brazil, Thursday, June 12, 2014. (Photo by Felipe Dana/AP Photo)