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 model makes a video call backstage during the Lakme Fashion Week X FDCI in Mumbai, India, Thursday, March 9, 2023. At the recently held premier fashion event, the backstage was buzzing as everyone from the hair and make-up artist to the stylist and the designer raced to get that perfect look that would stand out on the catwalk. (Photo by Rafiq Maqbool/AP Photo)

In this October 29, 2013 photo, Daniel smokes marijuana inside his apartment where he uses a hydroponics system to grow his weed in Mexico City. “I'm not a narco, dude. I just like to smoke”, said Daniel, who spoke on condition that his last name not be used because, he said, his home-grow operation is "super-illegal" despite being for personal use only. (Photo by Eduardo Verdugo/AP Photo)

Pigeons fly out from the mouth of a giant Buddha statue at Wat Nam Daeng Buddhist temple in Chachoengsao province, east of the Thai capital Bangkok, on October 11, 2020. (Photo by Mladen Antonov/AFP Photo)

A relative of a victim of the Ukraine International Airlines PS 752 plane that crashed after taking off from Tehran's Imam Khomeini airport reacts at Boryspil International Airport, outside Kiev, Ukraine on January 8, 2020. (Photo by Serhii Nuzhnenko/Reuters)

Takamoto Katsuta of Japan and Aaron Johnston of Ireland with their Toyota Gazoo Racing WRT Toyota GR Yaris Rally1 #18 during the Shakedown of the FIA World Rally Championship Kenya on June 21, 2023 in Naivasha, Kenya. (Photo by Massimo Bettiol/Getty Images)

A woman holding carrying a bird cage reacts as people flee following an Israeli strike in Rafah in the southern Gaza Strip on November 23, 2023, amid ongoing battles between Israel and the Palestinian militant group Hamas. (Photo by Mohammed Abed/AFP Photo)

Jockeys and their horses compete in the Cross Country Chase, the fourth race on the second day of the Cheltenham Festival at Cheltenham Racecourse, in Cheltenham, western England on March 12, 2025. (Photo by Justin Tallis/AFP Photo)