Table 2 Definitions of alien status categories in GAVIA.
From: The global avian invasions atlas, a database of alien bird distributions worldwide
Established | The species has formed self-sustaining populations in the area of introduction |
Breeding | The species is known to be breeding/have bred in the area of introduction, but is not thought to be self-sustaining |
Unsuccessful | The species has not formed self-sustaining populations (casual, incidental) |
Died Out | The species was once established but has now completely died out in the area of introduction. |
Extirpated | The species was once established but has now been actively exterminated in the area of introduction. |
Unknown | The status of the species in the area of introduction is not known and further clarification is necessary to determine which of the other five categories is appropriate. |
