Alien species are species that have been transported outside their natural ecological range as a result of human action.

The vast majority are unable to survive in an unfamiliar environment without human intervention and eventually die off. But some species manage to adapt to their new surroundings and eventually establish themselves in the wild, where they can cause significant ecological and economic damage.

Especies Exóticas Europeas. La respuesta de la Unión Europea – Comisión Europea (PDF 2.281 KB)