EW
Conservation Status

Extinct in the Wild
Species

Survives only in captivity or cultivation.
3 Species
Overview

Understanding This Status

Extinct in the Wild (EW) is an IUCN Red List category for a species that is known to survive only in cultivation, in captivity, or as a naturalized population outside its past range, with no remaining individuals in its natural habitat. It is considered extinct in its historical wild range, even though living individuals still exist under human care or outside that range.

Extinct in the Wild applies to taxa that are known to survive only in cultivation, in captivity, or as naturalized populations well outside their past (native) range. In other words, they are not known to persist in the wild within their past/native range. Assignment to EW generally follows exhaustive surveys (appropriate to the species' ecology and detectability) indicating that the taxon is no longer found in the wild within its past/native range.

This status can apply to both animals and plants, and it often reflects severe habitat loss, overexploitation, invasive species, disease, pollution, or other pressures that eliminated wild populations. Naturalized populations outside the historical range do not count as "wild in the native range," because they may exist only due to human introduction and may not represent restoration of the original ecological role or genetic structure of the species.

EW matters because it signals an extreme conservation emergency-wild recovery is no longer about preventing extinction in nature, but about rebuilding it from remaining individuals. Conservation priorities typically shift to safeguarding ex situ stocks, maintaining genetic diversity, addressing the original causes of loss, and planning carefully monitored reintroductions or reinforcements where suitable habitat and long-term protection exist. Success is possible, but only if threats are removed and there are enough healthy individuals to establish a viable, self-sustaining population within the species' historical range.

Common Misconceptions

IUCN Standards

Assessment Criteria

A species qualifies as Extinct in the Wild (EW) when it is known to survive only in cultivation, captivity, or as naturalized populations outside its past (historical) natural range, and there is no reasonable doubt that the last individual in its native habitat has died.

How species are assessed: EW is assigned after targeted, time-appropriate surveys across the species' historical native range fail to find any individuals in their natural habitat, and the only verified survivors are in cultivation, captivity, or as naturalized populations outside the native range. Assessors compile all records (recent sightings, specimen/photographic evidence, survey effort, detectability, threats, and persistence of captive stocks), and apply a precautionary but evidence-based judgment that there is no reasonable doubt the species is extinct in the wild in its native range.

≈80-90 species globally (commonly reported around ~84 EW species on the IUCN Red List) Species Globally
≈0.05% of assessed species (roughly ~84 out of ~157,000+ assessed) Of Assessed Species
↑ Increasing

EW listings tend to creep upward over time because some species decline from Critically Endangered to no longer having any self-sustaining wild populations (often leaving only captive or cultivated stock). Improved survey/monitoring can also confirm the loss of the last wild individuals, shifting species into EW. Downward movement (EW → threatened) does occur via successful reintroduction, but it is relatively rare and often slow, so it typically doesn't offset new additions.

Geographic Patterns: Concentrated in places with high endemism and strong pressures that can eliminate the last wild populations quickly-especially islands and isolated habitats. Hotspots include oceanic islands (e.g., parts of Hawaii and other Pacific islands), small-island systems (Caribbean, Indian Ocean islands), and highly localized mainland sites such as isolated montane forests, single-valley river systems, and restricted freshwater habitats. EW species are often those with tiny historical ranges where invasive predators/diseases, land conversion, and overexploitation can remove the final wild individuals before large-scale recovery is possible.

Implications

What This Means

For the Species

  • No known self-sustaining populations remain within the species' historical natural range; survival depends on ex situ populations (zoos, breeding centers, seed banks, cultivation).
  • Immediate extinction risk remains high because captive/cultivated populations can be small, genetically limited, disease-prone, or vulnerable to husbandry failures and catastrophic events.
  • Natural ecological functions in the original habitat are effectively lost (e.g., predation, pollination, grazing), and recovery requires rebuilding wild populations.
  • Reintroduction is possible but conditional on resolving the original causes of loss (habitat destruction, invasive species, persecution, disease) and ensuring suitable, secure habitat.
  • Long-term survival prospects hinge on rigorous captive management (genetic diversity, demography), biosecurity, and creating/maintaining reintroduction sites; without these, the species may progress to Extinct (EX).
  • Naturalized populations outside the historic range may provide demographic "insurance," but may not substitute for recovery in native ecosystems and can raise ecological/ethical concerns if invasive impacts occur.

Conservation Priority

Typically treated as an emergency and high-leverage category: the species is globally one step from complete extinction (EX), so conservationists prioritize securing and expanding ex situ populations, maximizing genetic diversity, and-when threats can be mitigated-planning and implementing reintroductions or assisted establishment in safe areas. Priority is especially high when (1) founders are few, (2) a viable release site can be secured, and (3) reintroduction can restore important ecosystem roles; it may be lower when threats are intractable, habitat is irreversibly lost, or captive populations are too small/genetically compromised for recovery.

Legal Protections

  • CITES (Convention on International Trade in Endangered Species): Often listed on Appendix I or II; trade and international movement of live specimens, parts, or derivatives typically require permits and strict controls (especially relevant for captive breeding, transfers between institutions, and any commercial trade).
  • U.S. Endangered Species Act (ESA): If listed as Endangered, the species receives strong protections against "take," import/export restrictions, critical habitat provisions (where applicable), and requirements for recovery planning; ex situ populations and reintroduction efforts may be covered through permitting (e.g., Section 10) and cooperative agreements.
  • European Union: EU Wildlife Trade Regulations (implementing CITES) restrict trade; Habitats Directive/Birds Directive can require strict protection and restoration measures for native species and habitats, supporting reintroductions where relevant.
  • National endangered species and wildlife acts (range states and holding countries): May prohibit capture, possession, trade, and harm; can mandate recovery plans and authorize reintroduction programs; permitting frameworks govern captive breeding and releases.
  • CBD (Convention on Biological Diversity): Encourages ex situ conservation, restoration, and reintroduction where appropriate, and national biodiversity strategies that can prioritize EW taxa.
  • Regional instruments (examples): Bern Convention (Europe), African Convention on the Conservation of Nature and Natural Resources, ASEAN wildlife frameworks, and other regional protected-area and species directives that may support habitat restoration and reintroduction governance.
  • Animal welfare and biosecurity laws: Captive care standards, transport regulations, veterinary controls, and quarantine requirements often apply and can shape breeding, transfers, and reintroduction feasibility.

Funding Implications

EW status often increases eligibility and urgency for funding aimed at preventing total extinction, supporting captive breeding, genetic management, and reintroduction preparation (habitat restoration, threat removal, feasibility studies). Many donors and agencies view EW projects as high-impact but also high-risk and long-term, so funding may be milestone-based and contingent on credible recovery plans, governance, and partner capacity. Access to funds can be helped by strong legal listings (e.g., CITES Appendix I, national endangered status) and clear reintroduction pathways; however, some funders may be reluctant if costs are high, success probability is uncertain, or ongoing captive care creates indefinite financial commitments.

Stories of Change

Status Transitions

Success Stories

Arabian oryx

extinct_in_the_wild vulnerable

After disappearing from its native range, coordinated captive breeding and staged reintroductions (paired with protection and management) rebuilt free-ranging herds, allowing the species to leave extinct_in_the_wild and be downlisted as wild populations recovered.

2011

Przewalski's horse

extinct_in_the_wild endangered

Once surviving only in captivity, the species was reintroduced to parts of its historic range (notably Mongolia) using managed releases and long-term monitoring, establishing wild-breeding populations sufficient to move it out of extinct_in_the_wild.

2011

Scimitar-horned oryx

extinct_in_the_wild endangered

Large-scale ex-situ breeding and carefully planned reintroductions restored wild populations within its native range (including releases in the Sahel), enabling an improvement from extinct_in_the_wild once wild reproduction and persistence were documented.

2023
How You Can Help

Take Action

Conservation Strategies

  • Maintain and expand assurance populations in accredited zoos, aquariums, botanic gardens, and seed banks (genetic management, studbooks, cryobanking).
  • Develop and implement Species Survival Plans/EEP-style coordinated breeding programs to maximize genetic diversity and avoid inbreeding.
  • Identify, secure, and restore suitable historical habitat (remove threats, restore hydrology/vegetation, improve connectivity, protect key sites).
  • Eliminate or control the original drivers of extirpation (invasive species eradication, predator control, disease management, pollution cleanup, stopping harvest/poaching).
  • Conduct feasibility assessments for reintroduction (habitat suitability, threat status, climate projections, social acceptance, long-term funding).
  • Plan and execute reintroductions using best-practice protocols (soft-release, pre-release conditioning, staged releases, post-release support/feeding when appropriate).
  • Establish rigorous health screening, quarantine, and biosecurity to prevent introducing pathogens during translocations and captive breeding.
  • Use genetic rescue tools where appropriate (managed gene flow among captive lines, genomic monitoring, assisted reproduction, tissue culture, micropropagation).
  • Create long-term post-release monitoring and adaptive management (telemetry, demographic surveys, trigger-based interventions).
  • Build legal and policy protections for reintroduction sites (protected areas, hunting/collection bans, trade enforcement, environmental impact safeguards).
  • Engage local and Indigenous communities as co-managers (benefit-sharing, stewardship agreements, conflict mitigation, livelihoods aligned with reintroduction success).
  • Develop ex situ-to-in situ "conservation supply chains" for plants (propagation pipelines, mycorrhizal/soil microbiome restoration, pollinator support).

How You Can Help

  • Donate to or sponsor targeted captive-breeding and reintroduction programs for EW species (look for projects that fund habitat restoration plus post-release monitoring).
  • Support accredited institutions (AZA/EAZA zoos, aquariums, botanic gardens, seed banks) through memberships or directed gifts earmarked for conservation breeding and genetic banking.
  • Volunteer skilled time (GIS, drone mapping, veterinary/animal husbandry, plant propagation, data science) with local reintroduction teams, botanic gardens, or conservation NGOs.
  • Advocate for protection and restoration of reintroduction sites: attend local land-use hearings, support protected-area creation, and oppose development that fragments candidate habitats.
  • Help prevent re-extinction by reducing key threats locally: participate in invasive species removal days, watershed cleanups, and community predator-proofing initiatives where relevant.
  • Practice biosecurity in nature: clean boots/gear, don't move plants/soil between sites, and follow quarantine guidance for hobbyist collections (especially for amphibians and plants).
  • Never buy wild-collected pets, plants, or animal products; choose captive-bred or certified sources and report suspected illegal trade to relevant authorities.
  • Support climate- and habitat-friendly policies (wetland protection, forest restoration, pesticide reduction) that increase the odds that reintroduced populations persist.
  • Contribute to citizen science and monitoring near reintroduction areas (eBird/iNaturalist/reef or plant monitoring) and follow guidance to avoid disturbing sensitive releases.
  • If you garden, plant native species, reduce pesticide use, and create habitat for pollinators-critical for reintroduced plants and the ecosystems they depend on.
  • Back community-led conservation in reintroduction regions (Indigenous stewardship funds, local ranger programs, coexistence/compensation schemes).
  • Share accurate information: educate others on what 'Extinct in the Wild' means and why habitat restoration and long-term monitoring are essential for successful reintroductions.

Conservation Status Lists

All Extinct in the Wild Species

3 species documented in our encyclopedia

Complete A-Z List

Père David's Deer Spix's Macaw Wyoming Toad

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