Zoological Society of London (ZSL)

Rule Changes

Co-author of the WWF Living Planet Report

The world's monitored wildlife populations fell 73% on average between 1970 and 2022, the WWF's Living Planet Report found. India's flagship species moved the other way: wild tigers more than doubled since 2010 to about 3,700, Asiatic lions climbed from 674 in 2020 to 891 in 2025, and greater one-horned rhinos now number over 3,300.

Updated Oct 27

Rule Changes

As of October 2026: Produces the Living Planet Index

Between 1970 and 2022, the average size of monitored vertebrate wildlife populations fell by 73%, according to the Living Planet Report 2026, published by WWF and the Zoological Society of London (ZSL). The index tracks 35,803 populations across 5,790 species of mammals, birds, fish, reptiles, and amphibians. The global average hides a split: half of tracked populations are stable or increasing, and tigers, tuna, elephants, and sea turtles have staged documented recoveries.

Updated Oct 11