Thousands of raccoons invade Mallorca's mountains: "When they're little they're monkeys, but then they stop loving them"

Engineers, scientists and farmers have developed custom technologies to mitigate the impact of invasive species, according to reports from local media in Spain. The focus has been on addressing the growing problem posed by feral raccoon populations in Mallorca, which have become a significant ecological concern due to their rapid expansion and potential threat to native wildlife. The issue gained attention after researchers from the Institute of Advanced Mediterranean Studies (IMEDEA-CSIC/UIB) conducted a study commissioned by the regional government to estimate the population size of these animals. This effort was part of broader conservation initiatives aimed at controlling invasive species through targeted capture and monitoring. The latest estimates suggest that around 3,000 raccoons currently live freely in Mallorca, though this number could range between 1,500 and 5,000. These figures were derived using statistical methods applied to data collected over several years, offering a more accurate understanding than previous assumptions based solely on trap captures. The methodology employed by the research team involved analyzing monthly capture records to infer the total population size. This technique, known as removal analysis, allows for estimating the number of individuals remaining in the wild even when direct observation is difficult. However, the process remains challenging, as access to certain areas is limited, and the probability of encountering raccoons in traps varies depending on environmental factors. Researchers acknowledge the limitations of such models but emphasize that they provide valuable insights into the scale of the problem. The presence of raccoons in Mallorca can be traced back to the early 2000s, with the first documented case occurring in March 2005. Initially, these animals were found abandoned by humans, likely due to irresponsible pet ownership. Over time, the population grew as some escaped from captivity or were released intentionally. By 2010, the first successful trapping efforts began, marking a shift towards active management strategies. Scientists believe multiple introductions occurred over the years rather than a single incident, highlighting the long-standing challenge of regulating non-native species. Veterinarians who specialize in exotic animals have observed changes in how raccoons are treated by owners. Elizabeth Fernández Torvales, a veterinarian at Exotely, recalls cases from two decades ago where raccoons were kept as pets. She notes that while young raccoons appear cute and playful, they mature into powerful animals capable of causing harm. Many owners eventually relinquish them, contributing to the increasing numbers in the wild. Regulations introduced in recent years have made it illegal to keep raccoons as pets, leading to a decline in new acquisitions but not eliminating the existing population. Efforts to control the raccoon population continue through coordinated actions involving local authorities and scientific institutions. The Conservation Consortium for the Recovery of Wildlife in the Balearic Islands (COFIB) plays a key role in capturing and relocating the animals, while ongoing research aims to refine population estimates and improve management strategies. As the situation evolves, the collaboration between different stakeholders remains crucial in mitigating the ecological impact of invasive species.