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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →An official ABA Area Big Year is a personal total of eligible bird species encountered between local midnight on January 1 and local 11:59 p.m. on December 31, anywhere within the defined ABA Area. A bird counts only when it is a qualifying checklist species, alive and wild, correctly identified from adequate evidence, and encountered ethically.
The American Birding Association (ABA) can change its checklist and interpretations, so verify the current rules and checklist before beginning a year and again when a taxonomic decision affects your list.
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What are the rules for an ABA Big Year?
The ABA rules define a Big Year by four questions: when the encounter happened, where it happened, what species was involved, and whether the encounter meets the recording and ethics standards. There is no universal minimum number of species that makes a year “official.” Your total is simply the number of distinct eligible species you document under those rules during the calendar year.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteFor a list intended for ABA recognition or comparison, use the Big Year rules and Recording Rules that apply to each encounter. A checklist revision published later can change which species are eligible, but it does not turn every unusual sighting into a countable record.
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When does an ABA Area Big Year start and end?
The annual window follows local time at the birder’s location when each boundary occurs. The ABA’s official wording is: “An ABA Area Big Year shall start at 12:00 AM on 1 January of that year and end at 11:59 PM, 31 December of that year, based on the local time of the location of the birder at each time threshold.”
- Start: 12:00 a.m. on January 1.
- End: 11:59 p.m. on December 31.
- Time zones: Use the local time where you are, not a single UTC cutoff. If you travel, the local place and time at the relevant threshold control.
An encounter just before local midnight on December 31 belongs to that year; one after midnight belongs to the next year. Keep the date and, when an observation is close to a boundary or involves travel, the local time and location in your notes.
What is the ABA Area?
The ABA Area is a geographic rule, not a synonym for the United States. It includes:
- The 49 continental United States.
- Hawaii.
- Canada.
- The French islands of Saint Pierre and Miquelon.
- Adjacent waters extending up to 200 miles from land, or half the distance to a neighboring country, whichever is less.
Bermuda, the Bahamas, and Greenland are outside the ABA Area. A bird seen there does not count toward an ABA Area Big Year, even if the species appears on the ABA Checklist.
The offshore limit can matter on pelagic trips. The vessel’s position at the time of the encounter must fall within the permitted waters. Do not assume that a trip marketed as “near” the area is automatically inside it; retain the route or coordinates when the boundary could be disputed.
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What counts on an ABA Area Big Year list?
Every counted bird must satisfy all of the following conditions. Missing one condition makes the encounter ineligible unless a specific ABA interpretation applies.
The encounter is inside the area and year
The bird must be encountered during the January 1–December 31 window and within the land or water boundaries of the ABA Area. A sighting outside those limits cannot be transferred onto the list later.
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The species is eligible on the ABA Checklist
The individual must belong to a species recognized by the ABA Checklist under the applicable taxonomy. Checklist status is separate from how often the bird occurs. Regular, rare, casual, and accidental species can all be eligible; a rarity code is not an automatic exclusion.
The bird is alive, wild, and unrestrained
ABA Recording Rule 3 states: “The bird must have been alive, wild, and unrestrained when encountered.” Captive birds, mounted specimens, museum skins, birds held in the hand, and birds released for an event do not qualify. A wild bird temporarily trapped for lawful banding is a specialized situation; follow the ABA’s current recording interpretation rather than assuming that every handling circumstance is countable.
You can identify it from sufficient diagnostic characteristics
The identification must rest on enough characteristics to establish the species. Those characteristics may be seen, heard, or documented. A photograph, recording, field notes, or another contemporaneous document can preserve the evidence, but a device label or an unverified automatic identification is not, by itself, a substitute for your own species-level determination.
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The encounter follows the ABA Code of Birding Ethics
Do not count a bird obtained by harassment, trespass, habitat damage, unsafe conduct, or other unethical behavior. Ethical access and observation are part of the eligibility test, not an optional courtesy after the list is complete.
How do checklist and taxonomy changes affect a Big Year?
Taxonomy can change while a Big Year is in progress. The ABA rules provide timing provisions so a birder is not forced to predict every future checklist decision on January 1.
| Checklist event | Effect under the ABA rules | Example or caution |
|---|---|---|
| A species is added during the Big Year | An encounter earlier in that same year can count if it otherwise met the rules. | Pacific Wren was added in November 2010 after a split from Winter Wren; it could count on a 2010 Big Year even when encountered earlier in 2010. |
| A species is removed | Removal does not automatically erase encounters from a year in which the species qualified. Apply the rule and interpretation for the relevant year. | The rules use Crested Myna to illustrate why a later removal does not invalidate qualifying records from earlier years. |
| A new area record is accepted later | A narrow retroactive exception can apply to a qualifying new, non-exotic species once it is added to the checklist. | The ABA’s Northwestern Crow and “Happy Wren” examples explain how acceptance and checklist addition can affect an earlier encounter. |
Keep the original observation date and evidence even when identification or taxonomy is later revised. Do not rewrite an old record to match a new name without preserving what you actually encountered.
What do the ABA checklist codes mean?
ABA Checklist codes describe occurrence or status, not a separate Big Year scoring system.
| Code | ABA description | What it means for your count |
|---|---|---|
| 1–2 | Regular species | Usually encountered in the area or season, but still subject to the normal evidence, wildness, ethics, and timing rules. |
| 3 | Rare | Can count when a qualifying individual is encountered. |
| 4 | Casual | Can count; infrequency does not disqualify it. |
| 5 | Accidental | Can count if the record is accepted under the applicable standards. |
| 6 | Cannot be found | Indicates the species is not currently expected to be found; consult the current checklist and rules before treating it as countable. |
Version 8.19 of the ABA Checklist, dated January 2026, lists 1,161 species. That number is a snapshot, not a permanent ceiling: splits, lumps, additions, removals, and other decisions can change the list.
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How to keep an auditable Big Year list
A reliable record makes it easier to apply the rules consistently and resolve a question months later. The ABA’s field-record guidance recommends capturing the basic facts of every outing.
- Record the date and local times. Note the outing date and, when practical, start and end times. This is especially important for sightings near New Year’s boundaries or during long-distance travel.
- Record the location. Use a precise site name and, for remote or offshore observations, enough route or position information to establish that the encounter was inside the ABA Area.
- Write the species list promptly. Record the species as you identified them, along with notes that preserve diagnostic marks, calls, behavior, or circumstances.
- Preserve supporting evidence. Keep photographs, sound recordings, sketches, and written notes with the original date and location. Evidence is most useful when it shows how the identification was made rather than merely repeating a final label.
- Track checklist changes. When the ABA adds, removes, splits, or lumps a species, annotate the affected entry instead of deleting the original observation.
Listing Central is the ABA resource for managing life, year, month, and Big Day lists. The ABA’s educational material also discusses eBird as a recordkeeping tool. Either can help organize observations, but using eBird alone does not guarantee that a record meets ABA acceptance standards.
Personal tracking versus an ABA-submitted list
You can maintain a personal Big Year tally without submitting it. If you submit a list to the ABA, apply the Big Year and Recording Rules current at the time of each encounter and use the ABA’s current instructions for the submission process. The available rule pages do not establish a universal deadline or a single supporting-document package, so do not assume that an informal online list is the complete submission.
A practical approach is to keep your complete field log first, then reconcile the total against the current checklist and ABA interpretations. That preserves records that may become relevant after a taxonomic decision and separates your own convenience from the standards used for an official list.
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“I heard the bird but never saw it. Does it count?”
It can, because the rules allow identification from characteristics that are heard. The call or song must provide sufficient diagnostic information for a defensible species identification, and the encounter must otherwise meet the area, time, wildness, and ethics requirements.
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“A bird escaped from captivity and was flying free. Is it countable?”
No. The bird must have been wild and unrestrained when encountered. A recently escaped pet or released captive is not transformed into a wild individual merely because it is flying outdoors.
“The bird was a famous rarity. Does rarity make it count automatically?”
No. Code 3, 4, or 5 status does not replace the identification and recording standards. You still need a qualifying encounter and enough evidence.
“I saw it before the ABA added it to the checklist. Did I lose the bird?”
Not necessarily. The Pacific Wren example shows that a species added during the year can count for an earlier encounter in that same year. Check the exact current wording when the decision involves a newly accepted area record or a non-exotic species.
“Does a sighting in the Bahamas or Bermuda count because it is close to North America?”
No. Those locations are specifically outside the ABA Area. The same exclusion applies to Greenland.
How the current checklist should guide your planning
Use the January 2026 total of 1,161 species as a checklist reference, not as a promise that all 1,161 are realistically findable in one year. The ABA’s codes distinguish regular species from rare, casual, accidental, and currently unfindable species; they do not predict your personal total or create a separate target.
Because checklist totals and taxonomy are volatile, check the latest ABA Checklist, Big Year rules, Recording Rules, ethics code, and Listing Central guidance when you start a year, when a major taxonomic announcement occurs, and before finalizing a submitted list. The rules, rather than a past year’s target or another birder’s total, determine what belongs on your list.
Putting the rules into practice
Before adding a species, ask four quick questions: Was I inside the ABA Area? Was it during the local calendar year? Was the bird alive, wild, and unrestrained and identified from adequate diagnostic evidence? Was the encounter ethical and the species eligible under the applicable checklist and interpretation?
If all four answers are yes, record the encounter with its date, time, location, species name, and evidence. If a checklist decision later changes the name or status, preserve the original record and apply the ABA’s timing rule instead of guessing from the new label.
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