Unique Polish Mammal on the Brink of Extinction as Pure Gene Pool Disappears Silently

The endangered European wildcat is slowly vanishing from Poland’s forests through uncontrolled hybridization with domestic cats, posing an irreversible threat to the species’ genetic purity.

A Silent Genetic Catastrophe

For decades, a silent process has been unfolding in Polish forests, threatening to completely erase one of our rarest wild mammals from the map of local fauna. The European wildcat, which is under strict species protection in Poland, is slowly ceasing to exist in its pure form due to uncontrolled interbreeding with domestic cats that produces fertile offspring.

In an interview with the Polish Press Agency (PAP), Prof. Marta Mendel from the Warsaw University of Life Sciences (SGGW) notes that science and local governments lack ready-made solutions, and in some regions of Europe, it is already too late for rescue.

Causes of Hybridization

The European wildcat and the domestic cat have lived side by side for millennia, but recent decades have brought a sharp increase in the scale of hybridization. The shrinking of natural habitats is the main factor destroying the pure population, forcing wild animals to approach human settlements where they easily come into contact with free-roaming or outdoor domestic cats.

The declining population of wildcats itself intensifies the problem; when finding a partner of the same species is difficult, these animals mate with domestic cats, producing offspring known as wildcat-cat hybrids. Because both species share an identical number of 38 chromosomes and an almost identical DNA profile, their offspring are fully fertile, leading to the irreversible dilution of the wild mammal’s pure gene pool.

Lessons from Scotland and the Situation in Poland

Scotland serves as an extreme example of the consequences of this process, where the European wildcat has already been declared functionally extinct precisely due to mass hybridization. As Prof. Marta Mendel points out in her interview with PAP, the largest wildcat population in Poland is found in the southeastern part of the country, including the Eastern Carpathians, Babia Góra, the Low Beskids, and the Magura National Park.

Prof. Mendel admits that there are currently no studies allowing researchers to precisely determine what percentage of Polish wildcats already carry domestic cat gene admixture. An additional difficulty is that hybrids cannot be reliably identified at first glance, as a hybrid can be visually almost identical to a wildcat, and only specialized genetic testing provides a definitive answer.

Disease Risks and Lack of Procedures

The blurring of species boundaries is not the only threat, as close contact between wild and domestic animals promotes the transmission of dangerous bacterial, viral, and parasitic diseases. Wild populations, which lack veterinary care, are exceptionally susceptible to these illnesses, while drug resistance genes from human environments can also find their way directly into forests.

Currently, Poland lacks clear, nationwide procedures for handling captured hybrids. Although castration or sterilization of a caught hybrid seems like a sensible solution, administrative law requires precise categories that cannot be easily defined in biology.

Saving the Wildcat

Experts emphasize that public education and pet owner responsibility are key to saving the Polish wildcat from the fate of its Scottish relatives. Preventing cats from roaming unsupervised in areas adjacent to wildlife refuges can realistically limit the scale of the problem.

A step in the right direction is the newly adopted act on the National Register of Microchipped Dogs and Cats, which will facilitate animal population control. Polish fauna still retains greater biodiversity and richer ecosystems than Western Europe, offering real hope for saving this exceptional wild mammal.