* Geographical Isolation: The Americas and Europe have been separated by vast oceans for millions of years. This isolation prevented the natural migration of opossums to Europe.
* Climate and Habitat: Opossums are adapted to the climate and habitats of the Americas. The climates and ecosystems of Europe differ significantly, making it challenging for opossums to survive and thrive.
* Competition and Predation: Europe already has a well-established ecosystem with its own native species. Opossums would likely face competition for resources and potential predation from European predators.
* Introduction and Establishment: While it's possible to introduce opossums to Europe, they have not been deliberately introduced or established as a species. This is likely due to concerns about their potential impact on the existing ecosystem.
In summary: Opossums are not found in Europe because of geographical isolation, climate differences, potential competition and predation, and the absence of deliberate introductions.