Feral

Feral bull in Sierra Nevada de Mérida, Venezuela
Feral horses (mustangs) in Oregon
Soay sheep in St Kilda, Scotland

A feral (from Latin fera 'a wild beast') animal or plant is one that lives in the wild but is descended from domesticated individuals. As with an introduced species, the introduction of feral animals or plants to non-native regions may disrupt ecosystems and has, in some cases, contributed to extinction of indigenous species. The removal of feral species is a major focus of island restoration.