Environment & Climate Education & Young People
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ZSL (Zoological Society of London)

Annual Report and Accounts 2024–25

ZSL (Zoological Society of London) is a science-driven conservation charity operating London Zoo and Whipsnade Zoo alongside field conservation in 80+ countries. In 2024–25 it welcomed 2.2 million zoo visitors, trained 500+ teachers, reintroduced the sihek bird to the wild after 40 years, averted extinction for the Mexican pupfish, and co-published the Living Planet Report revealing a 73% average decline in monitored wildlife populations since 1970.

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About

Two conservation zoos (London Zoo and Whipsnade Zoo); Institute of Zoology scientific research; species protection and breeding programmes; habitat restoration in priority regions; field conservation in 80+ countries; conservationist training programmes; global biodiversity monitoring including the Living Planet Index; policy and advocacy at international summits including CBD COP16 and COP29

Key Metrics

Key Metric 1 2.2 million visitors to London Zoo and Whipsnade Zoo, including 120,000+ students on educational visits — one of ZSL's best ever years
Key Metric 2 Conservation field projects active in over 80 countries across six global priority regions
Key Metric 3 500+ trainee and qualified teachers received wildlife education training; 190 field conservationists reached through pilot conservation education programme

Key Outcomes

  • Sihek (Guam kingfisher) successfully reintroduced to the wild at Palmyra Atoll — thriving in the wild for the first time in over 40 years, following decades of conservation breeding led by ZSL
  • Polynesian tree snail Partula tohiveana officially reclassified from Extinct in the Wild to Critically Endangered following ZSL-led decades-long breeding and reintroduction programme
  • UK Parliament passed an Act extending ZSL's London Zoo lease from 60 to up to 150 years, enabling long-term investment in the site

Geography

International

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