There are some birds that are seen around Sacramento area that are not in the official checklist. An exotic species is a non-native species either intentionally or accidentally
introduced. Some species, like the European Startling are introduced species
that are considered part of the regular bird list because they have
a self-sustaining breeding population. To make its way onto the official California or Sacramemto list, a species needs to be established for a number of years and thought to have a self-sustaining population in the wild. So the exotics consist of species seen but not established in the wild.
