Are feral cats misunderstood survivors or the world's most dangerous invasive predators?

Nature · Published 3 October 2026 Swipe more like this →

In short: With an estimated 480 million feral cats roaming the globe, these animals occupy a controversial space between apex predator and unwanted guest. While some view them as community members deserving of care, conservationists warn they are a catastrophic threat to biodiversity, responsible for the extinction of dozens of mammal species.

Feral cats are domestic cats that live independently of humans, avoiding contact and surviving in diverse environments ranging from urban centers to remote islands. Their global distribution is vast, stretching from 55° North to 54.3° South. While they are often labeled as invasive, their origins are deeply tied to human history; they likely spread globally via trading vessels and settlers, eventually establishing feral populations after moving away from human settlements. Today, they are recognized by the IUCN as one of the world's 100 worst invasive alien species.

The ecological impact of these predators is profound. In Australia, they are considered the primary threat to native wildlife, contributing to the loss of at least 28 mammal species. Their diet is incredibly broad, encompassing over 1,000 species, with a preference for small animals weighing under 100 grams. Beyond their role as hunters, they are also preyed upon by larger carnivores like coyotes and dingoes. Despite their reputation, studies of feral cats in trap-neuter-return programs suggest many maintain a healthy body condition, and some individuals in managed colonies live long lives.

Management of these populations remains a point of intense debate. Animal rights groups often promote trap-neuter-return (TNR) programs, yet scientific evidence suggests these methods are ineffective at controlling population numbers. Furthermore, there is no universal definition for what constitutes a 'feral' cat, leading to inconsistent policies across different countries. While some regions like Italy have implemented legal protections, other governments prioritize their removal to protect threatened species. The tension between the welfare of individual cats and the preservation of native ecosystems remains a complex, unresolved challenge for biologists and policymakers alike.

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