Small, isolated populations also risk extirpation by natural disasters and disease outbreaks (epizootics). Cutovers from forest harvesting have been identified as the strongest predictor of caribou extirpation. Fragmented colonies are more susceptible to extirpation, primarily by sylvatic plague. Most of the interventions made for treatment consisted of cortical extirpation. Wolf packs do not roam this region due to extirpation. In Britain, it is threatened with extirpation. This phenomenon is also known as extirpation. Extirpation, population decline and homogenization of regional biodiversity are much more common.