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The best documented answer is 165 bird extinctions since 1500, according to a 2024 scientific study of species recorded by the IUCN. That is not a count of every bird species lost in Earth’s history. The same study recorded 610 avian extinctions over roughly the past 130,000 years, while warning that many losses—especially before 1500—were never documented.
The figures differ because they use different time spans and evidence standards. The IUCN also separates species that are fully extinct (EX) from those surviving only in captivity or outside their natural range (Extinct in the Wild, EW), and it recognises “possibly extinct” categories that add uncertainty to any total.
What number should you quote for extinct bird species?
If the question means modern, documented losses, quote 165 IUCN-documented bird extinctions since 1500. Attribute that number to the 2024 study by Matthews and colleagues, rather than presenting it as a live IUCN category total. It is a historical count for a defined period, not a census of every bird that has ever disappeared.
| Figure | Time boundary and source | What it measures |
|---|---|---|
| 165 | Since 1500; Matthews et al., 2024 | Bird extinctions documented by the IUCN in the modern period |
| 610 | About 130,000 years; Matthews et al., 2024 | Recorded avian extinctions across the Late Pleistocene and Holocene, including prehistoric losses |
| 159 EX + 5 EW | As reported from IUCN summary tables in January 2021 | A dated Red List snapshot, not a current total |
| 1,256 of 11,185 | BirdLife International update, 2025 | Bird species assessed as threatened, not extinct |
| 61% | BirdLife International, 2025 | Assessed bird species with declining populations, not a count of extinctions |
These numbers answer different questions. Comparing them without stating the date, time window and category produces an apparent contradiction where none exists.
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How does the IUCN define an extinct bird?
The IUCN Red List uses a deliberately demanding standard. A species is Extinct (EX) when “there is no reasonable doubt that the last individual has died.” That wording matters: a species is not moved to EX simply because it has not been seen recently. Assessors consider available surveys, records and other evidence before deciding that continued survival is no longer reasonably possible.
Extinct in the Wild (EW) is a separate category. An EW species survives in captivity, cultivation or as a naturalised population well outside its former natural range, but no longer persists in its natural habitat. EW therefore means global survival under human care or in an introduced setting—not global extinction.
The Red List also uses the tags CR(PE) (Critically Endangered, Possibly Extinct) and CR(PEW) (Critically Endangered, Possibly Extinct in the Wild). These acknowledge that evidence can be insufficient for a definitive EX or EW decision. The IUCN explains that an estimate incorporating uncertainty can add those possible categories to the confirmed EX and EW categories; it also cautions that recent extinction totals are likely significant underestimates. See the IUCN summary-statistics guidance for how Red List totals are presented.
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Why can’t scientists give one all-time number?
There is no complete inventory of every bird species that has disappeared. The modern Red List record uses 1500 as its practical starting point for recent extinctions. Birds lost before that date do not enter the modern documented tally, even when archaeology, fossils or historical accounts show that they once existed.
Earlier losses are also harder to detect. A species that vanished from a remote island before written records may leave no specimen or unambiguous description. The 2024 study therefore treats its 610 recorded avian extinctions over approximately 130,000 years as a documented record, not a final total. Its authors specifically warn that many extinct birds may remain undiscovered, particularly among pre-1500 losses.
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Three additional sources of change complicate any running total:
- Evidence and rediscoveries: a bird can remain unconfirmed for years before new evidence supports a different category.
- Extinction dates: the year a species disappeared is often uncertain, so assigning a loss to a particular period can change as records are reinterpreted.
- Taxonomy: scientific revisions can split one species into several, merge species, or alter which name is considered valid. Counts can consequently change without a new extinction event.
What did the 2024 study actually count?
The study “The global loss of avian functional and phylogenetic diversity from anthropogenic extinctions” assembled records across a much longer timescale than the Red List’s modern window. It identified 610 recorded bird extinctions over the past 130,000 years. Within that set, 165 occurred after 1500 and were documented by the IUCN.
The two figures must not be added together or treated as interchangeable. The 610 figure spans prehistoric and historical periods; the 165 figure is the post-1500 subset with IUCN documentation. Neither claims to capture every unrecorded loss.
The study’s broader purpose was to examine how human-caused extinctions have reduced avian functional and evolutionary diversity. For a reader asking how many species have gone extinct, however, the key takeaway is the boundary: 165 is the defensible modern documented count cited by this research, while 610 is the longer-term recorded total.
Is the 165 figure the current IUCN total?
No. It should not be described as the current number of birds carrying the IUCN’s EX or EW labels. The study counted IUCN-documented extinctions for its analysis, whereas the Red List is a living assessment system whose entries and taxonomy can change.
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A dated example shows why caution is necessary. Audubon reported that IUCN summary tables listed 159 bird species as Extinct and five as Extinct in the Wild in mid-January 2021. Those figures are useful historical context, but they are not a November 2026 tally and should not be silently updated or presented as one. The accessible IUCN summary page does not provide a single current bird-only EX/EW number that can replace the study’s 165 figure here.
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Later assessments can confirm a species that had previously been considered possibly extinct, revise a species’ taxonomy, or change the evidence supporting its category. Every quoted total should therefore carry its source date and definition.
What did the Slender-billed Curlew update change?
BirdLife International’s 2025 update confirmed the Slender-billed Curlew as extinct. BirdLife described it as the first known global bird extinction from mainland Europe, North Africa and West Asia. The announcement illustrates how a documented total can change when an assessment moves from uncertainty to confirmation.
The update is not proof that exactly one species disappeared worldwide in 2025. It is a specific classification decision about one species whose evidence was reviewed. The safest wording is that the Slender-billed Curlew was confirmed extinct in BirdLife’s 2025 update, and that such decisions can alter future documented totals.
How are threatened and declining birds different from extinct birds?
Threat status describes risk of extinction, not a completed extinction. In its 2025 update, BirdLife International reported 1,256 threatened species among 11,185 assessed birds and said 61% of bird species had declining populations. Those statistics signal a severe biodiversity crisis, but the 1,256 species are not part of the 165 extinct total simply because they are threatened.
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A threatened species can still have living populations, sometimes over a large range. An extinct species has crossed the IUCN’s evidentiary threshold that no individual survives; an EW species survives only under the conditions described above. Mixing risk categories with extinction categories inflates the apparent number of losses and obscures which species still have recoverable populations.
BirdLife’s Dr Ian Burfield summarised the population-trend concern by noting that “three in five of the world’s bird species have declining populations.” That statement is about direction of change, not a claim that three in five birds are extinct.
How should you compare different extinction totals?
Before deciding that two sources disagree, label each number on five axes:
- Date or version: Is it a 2021 Red List snapshot, a 2024 study, or a 2025 assessment update?
- Time boundary: Does it cover since 1500, the past 130,000 years, or an even broader historical period?
- Category: Does it count EX only, EX plus EW, or possible categories such as CR(PE) and CR(PEW)?
- Evidence standard: Is the source counting confirmed classifications, documented historical losses, or an estimate that includes uncertain cases?
- Taxonomic unit: Is it counting species, subspecies or a broader taxonomic grouping?
For example, “165 since 1500” and “159 EX plus five EW in 2021” are not necessarily competing answers. They come from different sources, dates and counting frameworks. A careful explanation keeps those labels attached instead of collapsing them into one supposedly timeless number.
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For a documentary script, classroom caption or general explainer, use a two-part answer: “Scientists have documented 165 bird extinctions since 1500 in a 2024 study, but no complete all-history total exists. The same study records 610 avian extinctions over roughly 130,000 years, and the true number is likely higher because many losses—especially ancient or poorly documented ones—remain unknown.”
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Then explain that the IUCN distinguishes EX from EW and tracks possible extinctions separately. This wording gives the reader a useful number without implying that the number is a final count of every bird species ever lost.
Why does this distinction matter for conservation?
Extinction counts are backward-looking: they record losses after the evidence is judged conclusive. Threat assessments are forward-looking: they identify species whose populations or ranges are deteriorating while intervention may still prevent extinction. Keeping the measures separate helps conservationists direct habitat protection and recovery work toward birds that are still alive.
BirdLife’s 2025 emphasis on restoring habitats follows that logic. The figure of 1,256 threatened species and the 61% decline rate describe the scale of preventive action required; the 165 documented post-1500 extinctions describe losses that prevention did not avert. Both are important, but they answer different questions.
Frequently Asked Questions
What does the year 1500 mean in bird-extinction statistics?
The IUCN’s recent-extinction record uses 1500 as its cutoff for the modern documented tally. Birds that disappeared earlier can be included in longer archaeological or palaeontological studies, such as the 130,000-year window used by Matthews and colleagues, but they are not part of the post-1500 Red List count.
Why might an extinction number increase even when no bird has newly disappeared?
A reassessment can move a species from Possibly Extinct to Extinct, or a taxonomic revision can split one listed species into several recognised species. Better historical evidence can also reveal a loss that had not previously been documented, changing the recorded total without a new extinction event.
Can an Extinct in the Wild bird still have a conservation future?
Yes. EW means that surviving individuals are known in captivity, cultivation or an introduced population outside the former natural range. That is different from EX, so conservation planning can still concern the surviving stock and the possibility of restoring a wild population, although the category itself does not guarantee that recovery will succeed.
Where can I check the definitions behind an IUCN extinction label?
The IUCN’s official Categories and Criteria page explains the evidence standard for EX, EW and related categories. Its summary-statistics resource explains how Red List totals and uncertainty categories are reported, which is essential when comparing figures from different years.
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