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)

Wakodahatchee wetlands, Delray Beach, Florida, US. Equipped with sinewy necks and spear-like bills, great blue herons can lunge with fearsome speed to strike their aquatic prey. Adults will also employ rapid stabbing motions as one aspect of their complex courtship displays; they’re seemingly dangerous moves, but fitting to the intensity of mating season. (Photo by Melissa Rowell/Audubon Photography Awards)

A Siberian tiger at a photographer for getting too much in its face during the presentation of two new Siberian tigers at Cabarceno Natural Reserve in Cabarceno, northern Spain, 21 July 2014. (Photo by Pedro Puente Hoyos/EPA)

Two biplanes of the Team Breitling cross during a training flight prior the AIR14 air show in Payerne, Switzerland, August 29, 2014. (Photo by Peter Schneider/EPA)

A lion rests in the Nairobi National Park, Kenya on January 6, 2021. (Photo by Tiksa Negeri/Reuters)

Two young deer seem to look bashfully at the camera after a playfight in Bushy Park, London early February 2023. (Photo by Lesley Marshall/South West News Service)

Dallas Cowboys cheerleaders perform before the game against the New England Patriots in Arlington, Texas on October 1, 2023. (Photo by Kevin Jairaj/USA Today Sports)

The Pumawari Tusuy group performs for the crowd gathered in the park at the first Annual Indigenous Peoples' Day Ceremonial Celebration in Newton, Massachusetts on October 11, 2021. October 11 is a federal holiday to mark Columbus Day, but the day was also officially recognized as Indigenous Peoples' Day following a proclamation by US President Joe Biden. (Photo by Joseph Prezioso/AFP Photo)