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)

Costume details featuring Joao Candido, a black sailor who led a revolt against the physical punishment of Brazilian Navy soldiers at the beginning of the 20th century, lie inside the Paraíso do Tuiuti Samba school at the Samba City complex in Rio de Janeiro, Brazil, Tuesday, January 16, 2024. Samba schools are gearing up for this year's Carnival, scheduled from Feb. 9-17. (Photo by Bruna Prado/AP Photo)

A jaguar (Panthera onca) growls at the Mata Ciliar association, an organization for the conservation of biodiversity, in Jundiai, Sao Paulo state, Brazil on May 29, 2025. Twenty-five pumas and ten jaguars are currently recovering at the Brazilian Center for the Conservation of Neotropical Felines at Mata Ciliar, a site as large as 40 football fields where monkeys, wild dogs, maned wolves, ocelots, and other regional animals are also rehabilitated. (Photo by Nelson Almeida/AFP Photo)

Mug shot of De Gracy (sic) and Edward Dalton. Details unknown. Central Police Station, Sydney, around 1920. (Photo by NSW Police Forensic Photography Archive, Justice & Police Museum, Histiric Houses Trust of NSW)

A detained protester escapes from a police truck after riot police released teargas to disperse the #OccupyHarambeeAve demonstration in Kenya's capital Nairobi November 25, 2014. Kenyan police used teargas to disperse demonstrators shouting “President, Stop the killings!” outside President Uhuru Kenyatta's offices on Tuesday, in the protest over 28 people killed in a weekend attack claimed by Islamist militants. (Photo by Thomas Mukoya/Reuters)

Mug shot of William Stanley Moore, 1 May 1925, Central Police Station, Sydney. This picture appears in the Photo Supplement to the NSW Police Gazette, 28 July, 1926 captioned: “Opium dealer. Operates with large quantities of faked opium and cocaine. A wharf labourer; associates with water front thieves and drug traders”. (Photo by NSW Police Forensic Photography Archive, Justice & Police Museum, Histiric Houses Trust of NSW)

A demonstrator skateboards in front of a burning police vehicle during a protest against a new proposed policing bill, in Bristol, Britain, March 21, 2021. The Police, Crime, Sentencing and Courts Bill would give forces in England and Wales more power to impose conditions on non- violent protests, including those deemed too noisy or a nuisance, with fines or jail for those convicted. (Photo by Peter Cziborra/Reuters)

An undercover police officer, who had been marching with anti-police demonstrators, aims his gun at protesters after some in the crowd attacked him and his partner in Oakland, California December 10, 2014. Police said more than 100 demonstrators marched in Berkeley, California, which has a history of social activism. Under cloudy skies, turnout was smaller than earlier in the week, when demonstrators in the area threw rocks at police and shut down a major freeway. (Photo by Noah Berger/Reuters)