In 2020, researchers painted fake eyes on the rumps of cattle in Botswana and no eye-marked cows were killed by lions: A low-cost trick tested to reduce retaliatory killings of predators

A herd of cattle grazing across Botswana with large painted eyes on their rumps may sound unusual, but the idea came from a practical conservation problem. Across many parts of Africa, livestock losses to lions create economic hardship for farmers and often lead to retaliatory killings that threaten already declining lion populations. Finding ways to reduce these attacks without harming predators has become a major focus for conservationists. In 2020, researchers working with cattle in Botswana tested whether painting realistic eye patterns on the animals could discourage lions from attacking. The approach was based on a simple question: if a predator believes it has already been spotted, would it abandon the hunt? During the study, none of the cattle with eye markings were killed by lions, suggesting that a low-cost intervention based on predator behaviour could help reduce conflict between people and wildlife. The study was published in Communications Biology.Why would painted eyes affect a lion’s hunting behaviour?Lions are ambush predators, and rather than chasing prey over long distances, they depend on approaching unnoticed before launching a short attack. If a potential prey animal appears to have detected them, the chances of a successful hunt decline, and predators may abandon the attempt. Behavioural ecologists refer to this idea as the detection hypothesis, which proposes that predators are less likely to attack when they believe they have been seen.Eye-like markings are already found throughout nature. Butterflies, fish, caterpillars and other animals display conspicuous eyespots that can startle predators or create the impression that another animal is watching. Researchers wanted to know whether the same principle could influence the decisions made by large carnivores. The painted eyes were not intended to frighten lions directly. Instead, they were designed to create the impression that the cattle were aware of the predator’s presence, removing the element of surprise that lions typically rely on.What did the Botswana study find?Researchers carried out the experiment using cattle owned by local farmers in Botswana’s Okavango Delta, an area where livestock regularly share the landscape with lions and other large carnivores. The cattle were divided into three groups. Some received realistic eye markings on their rumps, others were painted with simple cross-shaped symbols to determine whether any visible marking would have an effect, and a third group was left unpainted. The animals then grazed under normal farming conditions while researchers monitored predator attacks over multiple grazing periods.None of the cattle painted with realistic eyes were killed by lions during the study. In contrast, losses occurred among both the unpainted cattle and those marked with crosses, suggesting that the eye pattern itself, not simply the presence of paint, was responsible for the difference. The researchers noted that the trial was conducted in one region with a specific lion population and that additional studies in other ecosystems would be needed to determine how broadly the findings apply. Even so, the results demonstrated that understanding predator behaviour could produce practical conservation tools without relying on expensive technology or intensive infrastructure.A simple idea with wider conservation valueWhen farmers lose animals to predators, retaliatory killings can become more likely, placing additional pressure on lion populations that already face habitat loss, declining prey and fragmentation across much of their range. Measures that lower livestock predation can therefore benefit both rural communities and wildlife.Researchers emphasise that painted eyes are not a replacement for established livestock protection practices such as attentive herding, secure night enclosures and predator-proof fencing where appropriate. The markings need to be maintained, and scientists are continuing to study whether lions might become accustomed to them over time or whether the technique works equally well in different landscapes. Even with those limitations, the study has attracted attention because it is inexpensive, easy to apply and based on an understanding of natural predator behaviour rather than attempts to remove predators from the landscape.The work also reflects a broader shift in conservation towards developing solutions that allow people and large carnivores to coexist instead of treating them as competing interests. Small changes informed by animal behaviour can sometimes reduce conflict in ways that are practical for local communities while supporting long-term wildlife conservation.Catch the latest World News and Live updates. Download the TOI app.