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)

Clowns Perlita and Tapetito, wearing protective gear amid the new coronavirus pandemic, speak with resident Enrique Zeballos as they arrive to disinfect his home free of charge, in El Alto, Bolivia, Friday, September 11, 2020. The lack of traditional employment for the clowns due to the pandemic has led them towards other avenues of making money. But for people with limited income they provide their disinfection services free of charge. (Photo by Juan Karita/AP Photo)

A woman with a large cross decorated with a Jesus figure during the use of water cannons by the police after heterogeneous groups around Corona deniers, conspiracy theorists and right-wing extremists called for blocking access to German Government Buildings in Berlin, Germany on November 18, 2020. Both the Bundestag and the Bundesrat vote on planned new regulations of the infection protection law. (Photo by Jan Scheunert/ZUMA Wire/Rex Features/Shutterstock)

Men ride a motorcycle carrying a fan in Havana, Cuba, Thursday, April 6, 2023. As Cuban citizens deal with the country´s many problems like electricity blackouts, empty stores and long lines for almost any service, they also have to manage with the lack of public transportation as there is a shortage of working buses and few privately owned vehicles. (Photo by Ramon Espinosa/AP Photo)

Athletes compete in a log carrying relay race event at Peruibe beach during the Indigenous Games, near the Tapirema community of Peruibe, Brazil, Sunday, April 23, 2023. Hundreds of Indigenous athletes gather this weekend in the south of Sao Paulo state to hold their version of the Olympic Games. They will compete for medals in archery, tug of war, athletics, Indigenous wrestling and other sports. (Photo by Andre Penner/AP Photo)

A girl swims in floodwaters in Malaysia' s northeastern town of Rantau Panjang, which borders Thailand, on January 5, 2017 Floods in two northeast Malaysian states have now forced almost 23,000 people from their homes and extra relief centres have been opened, rescue officials said on January 4. (Photo by Mohd Rasfan/AFP Photo)

Bangladeshi Muslim devotees arrive in an over-crowded train to attend the final day of an Islamic congregations' first phase in Tongi, 20 kilometers (13 miles) north of Dhaka, Bangladesh, Sunday, January 10, 2016. The second phase of the annual event, one of the world's largest congregations of Muslims is scheduled to begin Friday. (Photo by A.M. Ahad/AP Photo)

Revellers celebrate the death of Britain's former prime minister Margaret Thatcher in Brixton, south London April 8, 2013. Margaret Thatcher, the “Iron Lady” who transformed Britain and inspired conservatives around the world by radically rolling back the state during her 11 years in power, died on Monday following a stroke. She was 87. (Photo by Olivia Harris/Reuters)