An endangered species is a plant or animal facing a very high risk of extinction in the wild. The IUCN Red List — the global authority on species conservation status — currently classifies more than 47,000 species as threatened with extinction, representing 28 per cent of all assessed species. Amphibians are the most vulnerable vertebrate group (41 per cent threatened), followed by sharks and rays (37 per cent), mammals (27 per cent), and birds (12 per cent). The five main drivers are habitat loss, climate change, pollution, invasive species, and overexploitation — but targeted conservation action has proven that extinction is not inevitable.
What makes a species endangered?
A species is considered endangered when scientific evidence shows it faces a very high risk of extinction in the wild. This judgement is not subjective — it is based on measurable criteria including the rate of population decline, the size of the remaining population, the extent of the species' geographic range, and quantitative models of extinction probability.
Several factors can push a species toward endangered status: rapid habitat destruction, overexploitation through hunting or trade, the arrival of invasive competitors or predators, pollution, disease outbreaks, and increasingly, climate change. Most endangered species face not one of these threats in isolation but several acting simultaneously — a combination that can overwhelm even resilient species.
The formal system for assessing and classifying species at risk is maintained by the International Union for Conservation of Nature (IUCN), which has been evaluating extinction risk since 1964.
The IUCN Red List: how extinction risk is measured
The IUCN Red List of Threatened Species is the world's most comprehensive inventory of species conservation status. It uses nine categories to classify every assessed species:
| Category | Abbreviation | What it means |
|---|---|---|
| Extinct | EX | No reasonable doubt the last individual has died |
| Extinct in the Wild | EW | Survives only in captivity or cultivation |
| Critically Endangered | CR | Extremely high extinction risk (e.g. >90% decline, <50 mature individuals) |
| Endangered | EN | Very high extinction risk |
| Vulnerable | VU | High extinction risk |
| Near Threatened | NT | Close to meeting threatened criteria |
| Least Concern | LC | Low extinction risk; widespread and abundant |
| Data Deficient | DD | Insufficient data for assessment |
| Not Evaluated | NE | Not yet assessed |
The three highlighted categories — Critically Endangered, Endangered, and Vulnerable — are collectively referred to as "threatened". As of the 2025-2 Red List update, the IUCN has assessed more than 170,000 species worldwide. Of these, more than 47,000 are classified as threatened — approximately 8,500 of them Critically Endangered, the most urgent tier.
The global picture: how many species are threatened?
Threatened species are not evenly distributed across the tree of life. Some groups face far greater proportional risk than others:
Amphibians threatened
Reef corals threatened
Sharks & rays threatened
Mammals threatened
Cycads — an ancient group of seed plants that survived multiple mass extinction events — face the highest proportional threat of any group, with 71 per cent of species at risk. Conifers face 34 per cent threat levels, reptiles 21 per cent, and birds 12 per cent. A 2025 assessment found that 61 per cent of the world's approximately 11,185 bird species now show declining population trends — up from 44 per cent in 2016.
These percentages represent minimums. The IUCN has assessed only a fraction of the estimated 8–10 million species on Earth. Among invertebrates — which make up more than 99 per cent of animal species — assessments remain sparse. For the more than 1,000 fungal species now on the Red List, deforestation and agricultural expansion are emerging as primary threats. The true scale of the extinction crisis is almost certainly larger than the data currently show.
The overall trajectory is captured by the IPBES estimate: approximately one million plant and animal species face extinction, many within decades, unless transformative changes are made in how humanity relates to nature.
Biodiversity hotspots: where endangered species concentrate
Endangered species are not randomly distributed. They concentrate in 36 terrestrial biodiversity hotspots — regions that contain at least 1,500 endemic plant species and have already lost at least 70 per cent of their original vegetation. These hotspots cover just 2.5 per cent of the planet's land surface, yet they harbour more than half the world's plant species as endemics and 43 per cent of all endemic mammals, birds, reptiles, and amphibians.
Key hotspots include the Tropical Andes (containing roughly one-sixth of all described plant species), Sundaland (Borneo, Sumatra, Java), Madagascar, the Atlantic Forest of Brazil, the Mediterranean Basin, the Philippines, and Mesoamerica. In Brazil's Cerrado, approximately 4,000 acres of hotspot land converts to soybean farming daily. Pacific coral reef hotspots face new threats from fossil fuel infrastructure. Climate change is an escalating risk across all 36 hotspots — extreme weather, rising temperatures, and shifting precipitation patterns strand, orphan, and kill animals in regions already under intense human pressure.
Species with narrow ranges concentrated within a single hotspot are most vulnerable, because they cannot shift to unaffected territory when conditions deteriorate.
Iconic endangered species: population data and conservation status
Behind the statistics are individual species — each with a distinct ecology, a population trajectory, and in many cases, a compelling conservation story.
Giant panda — a conservation milestone
In September 2025, the IUCN upgraded the giant panda from Endangered to Vulnerable — the first downlisting of a high-profile species in recent memory. The wild population has grown from a few hundred in the 1970s to approximately 1,900 individuals, with 2,708 pandas worldwide including captive populations. China's 67 panda reserves now protect nearly two-thirds of all wild pandas. However, habitat fragmentation from roads, dams, and railways continues to isolate populations, and climate models suggest suitable habitat could shrink drastically by 2100.
Vaquita — the world's rarest marine mammal
Only 7–10 vaquita porpoises are estimated to survive in Mexico's Upper Gulf of California, making this the most Critically Endangered marine mammal on Earth. Gillnet fishing — both legal and illegal — is the near-exclusive cause of decline. Despite international bans and conservation campaigns, enforcement has been insufficient to prevent continued bycatch mortality.
Amur leopard — recovery from the brink
Russia's Far East recorded the highest-ever densities of Amur leopards in 2024 — 28 individuals identified by camera trap in Land of the Leopard National Park, up from just 16 in 2015 (a 75 per cent increase). Anti-poaching patrols and prey recovery (particularly sika deer) have driven this turnaround, though maintaining genetic diversity in such a small population remains a critical challenge.
Mountain gorilla — steady growth
Mountain gorilla numbers reached 1,063 in 2024, up from a low of 254 in 1981 — a fourfold recovery over four decades. Half the global population lives in Bwindi Impenetrable National Park, Uganda. Poaching, disease, and regional conflict remain threats, but the overall trajectory is positive.
African forest elephant — newly Critically Endangered
In 2025, the IUCN reclassified the African forest elephant as Critically Endangered, reflecting decades of poaching for ivory and accelerating habitat loss. Fewer than 415,000 individuals remain — a catastrophic decline from historical populations numbering in the millions. The African savanna elephant is now classified as Endangered.
Tapanuli orangutan — extinction-level disturbance
The Tapanuli orangutan, discovered only in 2017 and immediately listed as Critically Endangered, suffered a devastating blow in late 2025 when floods and landslides in Sumatra may have killed 35 individuals — 4 per cent of the total population of 577–760. With reproduction occurring only every 6–9 years, even small population losses have outsized consequences.
Pangolins — the world's most trafficked mammal
All eight pangolin species face extinction from illegal wildlife trafficking. In 2025, the US Fish and Wildlife Service proposed federal Endangered Species Act protection for seven pangolin species. CITES prohibits commercial trade, but enforcement remains inadequate — an estimated $20 billion illegal wildlife trade industry drives continued poaching.
Snow leopard, blue whale, and green sea turtle
Nepal's first national snow leopard census recorded 397 individuals — hopeful news for this high-altitude predator, though climate change threatens its mountain habitat. Blue whales, still Endangered, have recovered from near-total depletion thanks to the 1986 commercial whaling ban. Green sea turtles achieved a remarkable upgrade from Endangered to Least Concern in 2025, with Florida recording 77,042 nests in 2023 — more than double the 2021 count.
Why species become endangered: the five IPBES drivers
The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) identifies five main drivers of species decline. These rarely act alone — most endangered species face several simultaneously:
1. Land and sea use change — habitat destruction, degradation, and fragmentation from agriculture, urbanisation, and infrastructure. This is the most widespread driver, affecting 82 per cent of imperilled species in the US alone. Agricultural expansion and logging are the leading causes of bird population declines globally.
2. Climate change — now affects 91 per cent of species listed under the US Endangered Species Act. The 2025 Red List highlighted climate impacts on Arctic seals through accelerated sea ice loss. Mountain species face particular risk as warming forces range contraction upslope, with nowhere further to retreat.
3. Invasive species — affecting 52 per cent of US imperilled species through predation, competition, and disease. The chytrid fungus alone has contributed to the extinction of roughly 90 amphibian species and threatens more than 500 more. Invasive rats and feral cats devastate island bird populations.
4. Pollution — chemical contaminants, nutrient enrichment, plastics, light, and noise affect 34 per cent of imperilled species. Microplastics now appear throughout marine food chains, with 2025 research confirming biomagnification across 780 marine species.
5. Overexploitation — hunting, fishing, poaching, and collection beyond sustainable levels. This threatens 32 per cent of US imperilled species and drives 49 per cent of migratory species toward decline. Pangolins, great apes, and marine fish are among the worst-affected groups.
For a deeper analysis of these drivers, see our guide to the causes of biodiversity loss.
Conservation success stories: proof that recovery works
Amid the crisis, there is compelling evidence that sustained conservation effort produces results — sometimes extraordinary ones.
| Species | Low point | Current status | Key intervention |
|---|---|---|---|
| Iberian lynx | <100 (early 2000s) | 2,000+ (downlisted to VU, 2024) | EU LIFE projects, captive breeding, habitat restoration |
| Golden lion tamarin | ~560 wild (1990s) | ~4,800 (2022–23 census) | Reintroduction, forest reconnection, community engagement |
| Mauritius kestrel | 4 known (1974) | 300+ individuals | Intensive nest management, artificial nest boxes |
| Arabian oryx | Extinct in the Wild (1972) | Reintroduced to multiple sites; no longer EW | "Operation Oryx" captive breeding + reintroduction |
| California condor | 27 total (1987) | 500+ (wild + captive) | Captive breeding, lead ammunition regulation |
| Humpback whale | ~5,000 (1960s) | ~25,000 (delisted 2016) | 1986 commercial whaling moratorium |
| Green sea turtle | Endangered (declining) | Least Concern (2025); 28% increase since 1970s | Nest protection, harvest bans, habitat safeguards |
The Iberian lynx recovery — from fewer than 100 to over 2,000, earning a downlisting from Endangered to Vulnerable in 2024 — has been described as "the greatest recovery of a cat species ever achieved through conservation." These examples demonstrate that determined investment in protected areas, anti-poaching enforcement, habitat restoration, captive breeding, and community engagement produces measurable results, even for species facing severe endangerment.
Global and UK policy frameworks for species protection
Several international agreements underpin the global response to the extinction crisis:
CITES (Convention on International Trade in Endangered Species) — established 1973, now protects 38,000 species. Its 2025 assessment identified 3,124 species likely threatened by international trade, 43.5 per cent of which were newly categorised.
Kunming-Montreal Global Biodiversity Framework — adopted December 2022 under the CBD, it sets 23 targets for 2030 including Target 4: halt human-induced extinctions. It commits nations to protect 30 per cent of land and sea by 2030 (the "30x30" target).
CMS (Convention on Migratory Species) — 132 parties plus the EU. The 2026 CoP15 in Brazil added 44 species under protection. Recent assessments show 49 per cent of migratory species populations are declining.
In the UK, the framework includes the Wildlife and Countryside Act 1981 (Schedules of protected species), the NERC Act 2006 Section 41 (940 priority species in England), and the Environmental Targets (Biodiversity) Regulations 2023 setting a 2042 extinction risk target. The State of Nature 2023 report provides baseline data for 753 terrestrial and freshwater species. The Threatened Species Recovery Actions project (2023–2025) evaluated more than 1,900 species to prioritise conservation interventions. For more on UK conservation, see our guide to biodiversity and conservation in the UK.
How you can help protect endangered species
Individual action matters, particularly when it aggregates across millions of people:
Support conservation organisations — membership and donations to charities like the Wildlife Trusts, RSPB, WWF, ZSL, Butterfly Conservation, Plantlife, and Bat Conservation Trust fund frontline species recovery work.
Participate in citizen science — recording wildlife sightings through schemes like the RSPB Big Garden Birdwatch, Big Butterfly Count, iNaturalist, iRecord, and FreshWater Watch provides data that underpins conservation decision-making.
Make wildlife-friendly choices at home — hedgehog highways, native planting, a small pond, no-mow patches, and reduced outdoor lighting create habitat at the garden scale.
Make responsible consumer choices — choosing sustainably sourced products, avoiding goods derived from wildlife trafficking, and reducing plastic use all reduce pressure on endangered species and their habitats.
Engage politically — responding to planning consultations, writing to your MP on biodiversity legislation, and voting with species protection in mind amplifies conservation impact beyond the personal level.
Frequently asked questions
How many species are currently endangered?
The IUCN Red List classifies more than 47,000 species as threatened with extinction (Critically Endangered, Endangered, or Vulnerable combined), out of more than 170,000 species assessed as of the 2025-2 update. Approximately 8,500 of these are Critically Endangered. However, most of the estimated 8–10 million species on Earth have never been formally assessed, so the true number of species at risk is likely far higher.
What is the difference between endangered and critically endangered?
Both are IUCN Red List categories indicating high extinction risk. "Endangered" means a species faces a very high risk of extinction in the wild, while "Critically Endangered" means the risk is extremely high — typically requiring evidence of population declines exceeding 90 per cent, population sizes below 50 mature individuals, or quantitative models showing greater than 50 per cent extinction probability within ten years. Examples of Critically Endangered species include the vaquita (7–10 individuals) and the African forest elephant.
Which animal group is most endangered?
Among plants, cycads face the highest proportional threat at 71 per cent of species classified as threatened. Among animals, amphibians are the most endangered vertebrate group with 41 per cent of assessed species threatened, followed by reef-building corals (44 per cent), sharks and rays (37 per cent), and mammals (27 per cent). The chytrid fungus alone has contributed to the extinction of approximately 90 amphibian species and threatens more than 500 more.
Can endangered species recover?
Yes — and there is strong evidence for it. The Iberian lynx recovered from fewer than 100 to over 2,000, earning a downlisting to Vulnerable in 2024. The giant panda was downlisted from Endangered to Vulnerable in 2025 after decades of protected-area creation in China. Green sea turtles moved from Endangered to Least Concern following a 28 per cent population increase since the 1970s. The Arabian oryx was brought back from Extinct in the Wild through captive breeding and reintroduction. Recovery requires sustained investment, legal protection, habitat restoration, and often decades of effort.
What are the main causes of species endangerment?
IPBES identifies five main drivers: habitat loss and land/sea use change (the most widespread, affecting 82 per cent of US imperilled species), climate change (now affecting 91 per cent of US-listed species), invasive species (52 per cent), pollution (34 per cent), and overexploitation through hunting, fishing, and trade (32 per cent). Most endangered species face multiple threats simultaneously, and these drivers interact synergistically — meaning their combined effect is often greater than the sum of individual impacts.
Are there endangered species in the UK?
Yes. The UK's Section 41 priority species list identifies 940 species of conservation concern in England alone, spanning 22 taxonomic groups. The 2023 State of Nature report documented abundance data for 753 terrestrial and freshwater species, revealing ongoing declines across many groups. Notable at-risk UK species include the red squirrel, greater horseshoe bat, curlew, natterjack toad, stag beetle, and lady's slipper orchid. The Threatened Species Recovery Actions project (2023–2025) evaluated more than 1,900 species to prioritise recovery interventions.
What is the most endangered animal in the world?
The vaquita porpoise is widely regarded as the most critically endangered animal, with only 7–10 individuals estimated to survive in Mexico's Upper Gulf of California. Other species with extremely small remaining populations include the Tapanuli orangutan (577–760 individuals across three fragmented subpopulations in Sumatra) and the Amur leopard (28 individuals identified in Russia's Far East in 2024, though increasing). Many lesser-known invertebrate and plant species may be closer to extinction but lack the monitoring data to confirm their status.
The choice is ours
The extinction crisis is real, accelerating, and affecting every major group of life on Earth. More than 47,000 species are threatened. Amphibians, corals, cycads, elephants, great apes, sharks, and countless lesser-known organisms face population declines that — without intervention — will end in extinction.
But the evidence also shows that conservation works. From the giant panda to the Iberian lynx to the green sea turtle, determined investment in protected areas, anti-poaching enforcement, habitat restoration, and international cooperation has produced measurable, sometimes spectacular, recoveries. The Kunming-Montreal Framework commits the global community to halting human-induced extinctions by 2030 — an ambitious target, but one grounded in the evidence that species recovery is scientifically feasible when adequately resourced.
The question is not whether we can prevent extinctions. It is whether we will commit the resources, the political will, and the sustained effort to do so at the scale the crisis demands.
