Every year, hundreds of thousands of animals live and die behind the gates of Britain’s zoos. From majestic elephants and prowling big cats to tiny amphibians and exotic birds, they all have one thing in common: their lives are measured in spreadsheets, not in freedom and quality of life.

Zoos often claim they are conservation sanctuaries, protecting threatened species and preserving biodiversity. Yet when we examined the latest ‘stock’ records from over 200 of the 300+ licensed zoos across Great Britain, the truth became impossible to ignore: the majority of animals are not endangered, many suffer high mortality rates, and a negligible amount are ever released into the wild. The data paints a picture of captivity that is ineffective for conservation and often harmful, or even fatal, for the animals themselves.

In March 2025, Freedom for Animals requested the latest ‘stock’ lists from local authorities under the Freedom of Information Act. The goal was simple: to uncover the truth behind the cages and understand how Britain’s zoos are performing in regard to conservation, care and welfare. What emerged is both revealing and troubling.

What Counts as a Zoo?

Legally, a zoo is any establishment that keeps wild animals for public display, excluding circuses and pet shops, and is open to the public for at least seven days a year (Zoo Licensing Act 1981).

Licensed zoos must submit annual records including:

• Species names (common & scientific)

• Total animals at the start and end of the year

• Arrivals, births, deaths, and departures

• Sex of each animal, where known

These records are meant to protect the animals - but in practice, many lives remain hidden in incomplete or inconsistent data.

Gathering the Data

• 349 local authorities contacted, 163 had at least one licensed zoo

• Local authorities submitted data for 270 zoos, 217 usable records

• 270,753 animals across 18,815 species

To make sense of the data, taxonomic errors were corrected, species names standardised, and conservation status assigned using the IUCN Red List.

What the Data Reveals

Conservation: A Sobering Reality

The common narrative is that zoos exist to save species from extinction. But the numbers tell a different story:

• <14% of species in zoos are threatened in the wild (Critically Endangered, Endangered, Vulnerable)

• Only 16% of individual animals belong to these categories

The rest? They are animals that draw visitors - like zebras, giraffes and parrots - not species that urgently need saving. The glossy brochures may detail breeding programmes and conservation messaging, but the reality is that most animals in zoos serve no conservation purpose whatsoever.

Most animals exist for entertainment, or visitor appeal, rather than meaningful species preservation.

Captivity Isn’t a Sanctuary

Even for the small number of animals threatened in the wild, captivity offers no safety - only confinement, stress, and a high risk of dying behind bars. And when we look at the full picture across 217 zoos, the scale of loss becomes impossible to ignore:

• All species combined: 150,486 births vs 191,536 deaths 

• Threatened species specifically: 14,835 births vs 24,175 deaths

• In both cases, many more animals are dying in UK zoos than are being born

Every number represents a life. Every life lost is a reminder that captivity can never replicate the wild.

The Illusion of Conservation

Visitors are often told zoos are key players in saving endangered species. Yet our analysis shows:

• High mortality rates raise questions about welfare, husbandry and veterinary care

• Inconsistent record-keeping makes it impossible to track and monitor animals and ultimately hold zoos accountable

• Conservation of threatened species is not the main aim of zoos

• Most animals are kept for display rather than survival

Zoos are often presented as conservation heroes - but the reality is that most animals live lives defined by confinement, routine and premature death, with little chance of ever contributing to their species’ survival in the wild.

What the Data Makes Impossible to Ignore

Britain’s zoos do not save species and often fail to provide adequate living conditions. Behind every statistic is a life: an elephant pacing a concrete enclosure, a parrot in a tiny cage, a reptile unable to bask naturally. The lives behind the data deserve more than survival - they deserve freedom, complexity and dignity.

This isn’t just a critique of individual zoos - it’s a critique of a system that claims to protect wildlife while keeping millions of animals in captivity for no conservation benefit, and ultimately just for profit.

It’s time to rethink zoos entirely, to question the myths they promote, to shift to ethical, cruelty-free alternatives, and to prioritise real, effective conservation strategies that don’t come at the cost of animals' lives and their freedom.