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)

Nick Bull captured the Geminid meteor shower above Stonehenge in Wiltshire, UK on December 14, 2023. (Photo by Nick Bull/Picture Eexclusive)

National Geographic photographer Steve Winter has spent most of his adult life shooting wild cats. Photo: A 14-month-old cub, cooling off in a pond, is riveted by a deer that appeared near the shore. Tigers are powerful swimmers; they can easily cross rivers four to five miles wide and have been known to swim distances of up to 18 miles. (Photo by Steve Winter/National Geographic)

The “Dancing With Costica” series began when Australia-based photographer Jane Long decided to brush up on her retouching skills. After finding the Costica Acsinte Archive on Flickr, she became fascinated with the images and their subjects, wanting to bring them to life and give them a story. Here: the Costica photo on the left inspired Jane Long to create her version, titled “Innocence”. (Photo by Costica Acsinte Archive/Jane Long)

Rapper Cardi B attends the 65th GRAMMY Awards on February 05, 2023 in Los Angeles, California. (Photo by Matt Winkelmeyer/Getty Images for The Recording Academy)

English actress Florence Pugh, left, and American actress and filmmaker Zoe Lister-Jones embrace at a special screening of “A Good Person” at Metrograph on Monday, March 20, 2023, in New York. (Photo by Evan Agostini/Invision/AP Photo)

Alexander Levine crosses the Verrazzano-Narrows Bridge during the marathon in New York on November 3, 2024. (Photo by Brendan Mcdermid/Reuters)

Drone photo of a dead humpback whale at Foelle Strand in Loegten Bay, Djursland, Denmark, on April 2, 2025. (Photo by Mikkel Berg Pedersen/Ritzau Scanpix via Reuters)