Originally published 2020-05-23.
In spring 2020 a short video filmed at a zoo in Beijing showed an adult tiger walking the same tight loop inside a bare enclosure, over and over, without pausing. The clip spread quickly online and prompted sharp criticism of the zoo. Animal welfare specialists say this kind of repetitive pacing is a recognised warning sign that a captive animal's needs are not being met.
This article explains what the video showed, how the zoo responded, what experts mean by stereotypic behaviour or "zoochosis", and what good care for a big cat in captivity looks like.
What the footage showed
The video, which reportedly leaked from a Beijing zoo before being picked up by British newspapers, showed a large tiger circling inside a cage with hard surfaces and little else. There was no vegetation, water or cover, and no sign of the varied terrain a tiger would use in the wild. The animal followed an identical path again and again, a pattern that keepers and researchers instantly recognise.
Readers who saw it described it as heartbreaking. For many, it became a symbol of wider concerns about how wild animals are kept in parts of the zoo industry. The original video embedded in this article is no longer available online.
(The video originally embedded here is no longer available on YouTube.)
How the zoo responded
According to media reports at the time, zoo representatives said the tiger had been taken for behaviour training and given extra food and toys, likening the measures to "psychological counselling". The zoo did not publish further details of the programme.
Specialists were unconvinced. Sun Quanhui, a senior scientific adviser at the charity World Animal Protection in China, was quoted saying that extra toys alone are not real counselling. He argued that the case was far from unique, describing predators kept in cement cages or behind steel bars in many Chinese zoos, and social species held on their own, conditions he regarded as a form of mistreatment that causes significant psychological distress.
What "zoochosis" and stereotypic behaviour mean
The word "zoochosis" was coined in 1992 by Bill Travers, co-founder of the UK charity Born Free, to describe the abnormal, repetitive behaviour seen in many captive wild animals. Scientists usually prefer the term stereotypic behaviour, or stereotypy: actions that are repeated, unvarying and have no obvious purpose.
Born Free cites animal welfare scientist Georgia Mason, who in 2005 described these behaviours as stemming from "the frustration of natural behaviour patterns, impaired brain function, or repeated attempts to deal with some problem". Common examples include:
- Pacing and circling, often wearing a visible track into the ground, typical of big cats, wolves and bears
- Swaying, weaving and head-bobbing, seen in elephants and bears
- Bar-biting and tongue-playing, seen in giraffes and primates
- Over-grooming and self-harm, including hair or feather plucking
The behaviour is widespread. Born Free's 1993 report drew on more than three years of filming at over 100 zoos in Europe, North America and the Far East, and Travers said he saw some form of abnormal behaviour at every one. Studies of zoo elephants have found stereotypies in up to around half of individuals.
Why tigers are especially vulnerable
Tigers are built to roam. In the Russian Far East, scientists have recorded female home ranges of roughly 250 to 520 square kilometres and resident male ranges approaching 2,000 square kilometres. Even in productive Indian reserves a male may cover a hundred square kilometres or more. Tigers are mostly solitary, patrol and scent-mark their territory, stalk prey, swim and rest in dense cover.
A cage of a few dozen square metres removes almost all of that. A widely cited study of captive carnivores, published in Nature in 2003, found that species with large natural ranges tend to show more pacing in zoos, which helps explain why big cats are among the animals most often seen walking the same line.
It is important to read a single clip carefully. Pacing can also appear before feeding time or when an animal is anticipating a routine, and one video does not show the whole of an animal's day. But persistent, rigid pacing in a barren space is exactly the pattern welfare scientists treat as a red flag.
What better care looks like
Good zoos and sanctuaries use environmental enrichment to reduce stereotypic behaviour. For tigers that can mean:
- larger enclosures with natural ground, vegetation, hiding places and raised platforms
- pools for swimming, which many tigers enjoy
- food hidden or delivered unpredictably to encourage searching and "hunting"
- new scents, objects and textures rotated regularly so enrichment does not become stale
- positive-reinforcement training that gives animals some choice and control
Enrichment often helps, but it is not a guaranteed fix. Once a stereotypy is deeply established it can persist even after conditions improve, which is why prevention through suitable housing matters so much.
The bigger picture for captive tigers
The tiger is listed as Endangered by the IUCN, with recent estimates of only a few thousand left in the wild. More than 8,000 tigers were reported to be held in captivity across Asia in 2020, many in facilities with little connection to conservation. Campaigners argue that keeping big cats in bare cages offers neither education nor conservation value, and that accredited standards and stronger regulation are needed.
The Beijing video struck a chord because it showed, in a few seconds, what welfare scientists have documented for decades. The hope is that the tiger in that clip, and others like it, can be given space and stimulation closer to what their species needs.
Sources: Born Free: Zoochosis; Wikipedia: Stereotypy (non-human); Wikipedia: Tiger. Statements from the zoo and Sun Quanhui as reported by the Daily Mail and the Express in 2020.
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