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 horse pulls a driving school car as other drivers push their vehicles behind during a demonstration by driving instructors in Belgrade, September 25, 1992. Due to gasoline shortage in the Yugoslav capital, driving instructors are staying away from work. (Photo by AP Photo)

“La Diablada” dancers take part in a celebration in honor of the Virgin del Carmen, patron saint of Chile, in Santiago, Chile, Saturday, July 16, 2022. Hundreds of cowboys in woolen ponchos and families on wooden horse carts lined up to receive a priest's blessing in the huge esplanade in front of the National Sanctuary of Maipu on Saturday afternoon. (Photo by Esteban Felix/AP Photo)

Rwandan refugees cross the Rusumo border to Tanzania from Rwanda carrying their belongings, goats, mattresses and cows, May 30, 1994. The bloodshed that claimed 800,000 Tutsi and moderate Hutu lives began 25 years ago on April 7, 1994, when a plane carrying Rwandan President Juvenal Habyarimana, Burundi President Cyprien Ntaryamira and a French air crew was shot down. (Photo by Jeremiah Kamau/Reuters)

A man wearing a face mask amid the COVID-19 pandemic passes a mural of Venezuelan President Nicolas Maduro in Caracas, Venezuela, Wednesday, July 22, 2020. Analysts say that in recent months the pandemic has helped suck away the opposition’s scanty momentum and bolster Maduro’s already strong hand. (Photo by Ariana Cubillos/AP Photo)

China's Sun Jiajun competes during the men's 4x100m medley relay swimming heat at the 19th Asian Games in Hangzhou, China, Tuesday, September 26, 2023. (Photo by Lee Jin-man/AP Photo)

(L-R) Chris Diamantopoulos, AnnaLynne McCord, Matt Jones and Jane Seymour visit the Build Series at Build Studio on January 23, 2018 in New York City, United States. (Photo by Brad Barket/Getty Images)

MotoGP Ducati Lenovo Team rider Marc Marquez (R) of Spain and his girlfriend Gemma Pinto (L) celebrate his World Champion 2025 title after the race at the Motorcycling Grand Prix of Japan in Motegi, Tochigi Prefecture, northeastern Japan, 28 September 2025. (Photo by Franck Robichon/EPA)