Checklist Codes

Code-1 and Code-2: Regularly occurring North American avifauna.
Includes regular breeding species and visitors. There is no firm designation between Code-1 and Code-2 species, except that logically Code-1 species are more widespread and are usually more numerous. Code-2 species have a restricted North American range, are more widespread, but occur in lower densities, or are quite secretive making their detection often difficult. We readily acknowledge that some Code-2 species are harder to find than some species that have higher codes.

Code-3: Rare.
Species that occur in very low numbers, but annually, in the ABA Checklist Area. This includes visitors and rare breeding residents.

Code-4: Casual.
Species not recorded annually in the ABA Checklist Area, but with six or more total records—including three or more in the past 30 years—reflecting some pattern of occurrence.

Code-5: Accidental.
Species that are recorded five or fewer times in the ABA Checklist Area, or fewer than three records in the past 30 years.

Code-6: Cannot be found..
The species is probably or actually extinct or extirpated from the ABA Checklist Area, or all survivors are held in captivity (or releases are not yet naturally re-established).

For more information on Birding Codes please see pages 13-14 of “ABA Checklist: Birds of the Continental United States and Canada” Sixth Edition 2002.

Enter or View List Totals

REGISTERED USERS

Archives

  • ABA Blog
  • The Eyrie
- Nate Swick

If you haven’t been paying attention to Cornell’s exceptional Birdcast site in preparation of the co [...]

- Nate Swick

The next episode of the American Birding Podcast is live! Nathan Pieplow’s new field guide is a depa [...]

- Ted Floyd

Chandler Seymour Robbins, one of the greatest birders and field ornithologists of all time, died yes [...]

- Jennie Duberstein

The judges have reviewed all of the outstanding entries. ABA staff has compiled the scores. After mu [...]

- The Eyrie

In 2014 I was given the opportunity to go birding for the first time as part of a new All About Bird [...]

- The Eyrie

Did you know the Bar-tailed Godwit has the longest non-stop, flapping flight migration of any bird i [...]

ABA Marketplace

No items.