For some migratory birds a judgment was made as to their significance. This checklist estimates populations based on available information. Rating systems based on chance of observation favor highly visible species and thus distort reality for nocturnal or secretive species that could be equally common. Ratings in the checklist apply to during the right season and in the proper habitat. Though studies rely on capture and radio-tracking, some bat species are very adept at eluding capture.
Bats are also difficult to identify unless found at a roost or captured.
Fish are not easy to observe, and their populations have not been studied well. The list included here is based on State Information and knowledge of local fish and wildlife biologists. Breeds here or nearby. Always present, but not necessarily the same individuals. In some species, arrival may be as early as September and departure as late as April.