Traces of rat poison have been discovered in 78 percent of caracals tested in Cape Town, South Africa, according to a scientific study examining wild cats killed primarily in road traffic accidents.
Researchers analyzed liver tissue samples from 102 caracals that inhabited the coastal city, discovering that a significant majority of the animals had ingested toxic chemicals intended to control pest populations.
The findings were published in the international journal Environmental Pollution and reported by wildlife magazine Discover Wildlife, raising urgent concerns among conservationists over the hidden risks chemical rodent controls pose to non-target predators.
Widespread chemical contamination in urban wildlife
The study revealed that most of the affected Cape Town caracals were exposed to at least three distinct chemical compounds, with individual animals carrying up to six different toxic substances simultaneously.
Toxic chemical levels were notably higher in older caracals, pointing to repeated exposure over prolonged periods as the cats hunted within human-dominated environments.
Caracals are medium-sized nocturnal wild cats native to Africa, parts of the Middle East, and Asia, recognizable by their long ears topped with distinctive black tufts. In urban environments like Cape Town, where human development borders wild habitats, the predators routinely hunt rodents, birds, and other small mammals.
A major conflict arises when caracals prey on rats and mice that have previously consumed rodenticide baits. These poisons function by interfering with normal blood clotting mechanisms, leading to fatal internal bleeding.
Risks of second-generation rodenticides
Analysis of the liver samples showed a heavy predominance of second-generation anticoagulant rodenticides. These modern formulations are significantly stronger and persist in animal tissues much longer than earlier first-generation treatments.
A rodent that ingests a second-generation poison can take up to two weeks to succumb. During this extended period, the rodent continues feeding and accumulating high chemical concentrations, effectively becoming a moving source of poison for predators and scavengers.
Gabriella Leighton from Stellenbosch University, a public research institution in South Africa, described caracals as red warning lights positioned at the top of the local food web. She explained that caracals move easily between natural reserves, agricultural farms, and suburban areas while preying on diverse species, noting that the pollutants accumulating in their bodies reflect broader environmental contamination across the entire landscape.
Health concerns and regulatory demands
Although caracals rarely die as a direct result of eating poisoned prey, wildlife experts fear that sublethal chemical doses inflict chronic health damage. Comparative studies on North American bobcats showed that exposure to rat poison was linked to persistent tissue inflammation, impaired immune system response, and heightened vulnerability to disease.
It remains unclear whether caracals experience identical physiological harm, but the elevated exposure rates observed in Cape Town have alarmed researchers. The threat is amplified by the widespread commercial availability of rodenticides across South Africa, where dozens of chemical products are sold over the counter in supermarkets, hardware stores, and online stores for use by both professional pest operators and the public.
In response to the study, scientists are calling for tighter regulation over the sale and distribution of second-generation anticoagulant poisons, urging authorities to restrict their application exclusively to certified pest control specialists. They also recommended preventative pest management strategies, such as securing food waste, sealing building entry points, and employing mechanical traps to reduce chemical reliance.
