The challenge of cat colonies: biodiversity and urban management under debate

  • A scientific study confirms that feline colonies drastically reduce populations of endemic reptiles on the islands.
  • The CER method is becoming established in large municipalities as the main control tool, although with budgetary limitations.
  • Artificially feeding stray cats alters the diet of wild species and attracts invasive fauna such as rats and pigeons.
  • Local councils face difficulties in complying with the Animal Welfare Law due to a lack of resources and an overwhelming number of volunteers.

Management of stray cat colonies in urban and natural environments

Living alongside groups of cats in our cities and natural environments has become a topic that generates as much passion as controversy. With the implementation of animal welfare regulations, the responsibility for controlling these stray cat colonies has fallen directly on the shoulders of local councils, which find themselves balancing the care of the felines with the protection of native wildlife and public health. It is not an easy task, especially when factors such as the municipal budget and the sensitivities of residents come into play.

In recent months, various reports and local experiences have shown that the management of these feeding stations affects more than just the cats themselves. The reality is that they generate a chain reaction that transforms the surrounding ecosystem, attracting other species and altering the behavior of animals already living there. While some municipalities are making significant progress with censuses and sterilization programs, others are completely overwhelmed by a lack of resources and the pressure of a cat population that continues to grow unless swift and decisive action is taken.

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The real impact of colonies on island biodiversity

Ecological impact of stray cat colonies

Recent research conducted in areas like Tenerife has raised alarm among conservation experts. By analyzing the areas near feline feeding stations, scientists have discovered that the population of local reptiles, such as the Tenerife lizard, is plummeting . In fact, it is estimated that in areas without cats, there are 120% more lizards than in the vicinity of these colonies. It turns out that felines have a clear preference for hunting the largest individuals, which ultimately diminishes the species' capacity for recovery and reduces the average size of the survivors.

But the problem isn't limited to direct hunting. It has been observed that these lizards have begun frequenting feeding stations to eat cat food , which disrupts their natural diet. Although this helps them gain weight, it doesn't compensate for the risk of being so close to their predators. Furthermore, these feeding stations become a magnet for other animals that no one wants to see too close, such as rats, pigeons, or even invasive exotic species, ultimately throwing the ecological balance of the area into disarray.

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Municipal management and the challenge of the CER method

Volunteers managing colonies of stray cats

To try and bring order to this chaos, many Spanish towns have invested heavily in the TNR (Trap-Neuter-Return) program , which involves capturing, sterilizing, and returning the animal to its environment. In cities like Getafe, this system has already allowed for the sterilization of 80% of the feline population , even using computer applications to geolocate colonies and keep track of the nearly 1.500 cats living on its streets. It's a monumental task that requires perfect coordination between municipal services, veterinary clinics, and, of course, the volunteers who dedicate themselves tirelessly every day.

However, it's not all rosy. In many other parts of Spain, such as Ávila, those responsible for caring for these animals say they are at their breaking point. The main obstacle is usually money: when most of the budget goes to managing external companies, there are barely enough left to buy food or cover the costs of necessary neutering. This situation creates a climate of constant tension, where those who feed cat colonies take on responsibilities that belong to the city council, while the municipal authorities sometimes aren't even sure how many colonies actually exist in their streets.

The lack of resources is even more evident in small towns, where municipal ordinances sometimes have to remind residents that feeding cats indiscriminately is prohibited to prevent infestations and unpleasant odors. It is essential that higher levels of government step up and offer technical and financial support to municipalities with fewer resources. Only through integrated management that considers not only the well-being of the cats, but also the protection of wildlife and harmonious coexistence among neighbors, can a problem be solved that, if left unaddressed, will only worsen over time.

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