# How Many Species Are Endangered? What the IUCN Red List 2026-1 Actually Says

*GLOBAL · AUG 2 2026*

> More than 49,500 species are currently threatened with extinction on the IUCN Red List — that is 28% of the 175,909 species assessed so far. The figure is not a count of all endangered species on Earth, because most species have never been assessed: the IUCN's own target is 260,000 assessments, leaving 84,091 still to do.

The IUCN Red List has now assessed 175,909 species, and more than 49,500 of them are threatened with extinction — 28% of everything assessed. But the headline number is routinely misread. Here is what it counts, what it leaves out, and why the true total is almost certainly higher.

## What are the key takeaways from this briefing?
- The IUCN Red List version 2026-1 has assessed 175,909 species; more than 49,500 are threatened with extinction.
- That is 28% of assessed species — but not 28% of all species, because the vast majority of life on Earth has never been assessed.
- Threat levels vary enormously by group: 71% of cycads and 44% of reef corals are threatened, against 11% of birds.
- "Threatened" is a precise term covering three categories — Vulnerable, Endangered and Critically Endangered — not a loose synonym for "declining".
- The IUCN aims to assess 260,000 species and reassess 142,000 under its 2021–2030 Strategic Plan; 84,091 assessments remain to reach that goal.

The most common question about endangered species has a specific, checkable answer — and it is almost always quoted incorrectly. As of version 2026-1 of the IUCN Red List of Threatened Species, **175,909 species have been assessed and more than 49,500 are threatened with extinction**. That is 28% of everything assessed.

## What "threatened" actually means

"Threatened" is not a mood or a trend. On the Red List it is the union of exactly three categories:

- **Vulnerable (VU)** — high risk of extinction in the wild

- **Endangered (EN)** — very high risk

- **Critically Endangered (CR)** — extremely high risk

Species listed as Near Threatened, Least Concern, Data Deficient or Not Evaluated are not counted in the 49,500. This matters, because a species can be in steep decline and still sit outside the threatened categories — and a species can be listed as Data Deficient simply because nobody has surveyed it.

## Why the number is not the number

The 28% figure is the share of *assessed* species, not the share of all species. Science has described roughly 2 million species and estimates many millions more remain undescribed. The Red List has assessed 175,909 of them. The IUCN's own Strategic Plan for 2021–2030 targets 260,000 assessments — meaning **84,091 assessments remain outstanding** against its current goal, and that goal is itself a fraction of described life.

Assessment effort is also not evenly spread. Vertebrates, and especially mammals and birds, are far better covered than invertebrates, fungi and plants. So the headline percentage is drawn disproportionately from the best-studied groups, and the groups we know least about are the ones most likely to be quietly disappearing.

## Threat levels by group

The aggregate figure hides enormous variation. From the same 2026-1 release:

- **Cycads — 71%** threatened, the highest of any assessed group

- **Reef corals — 44%**

- **Amphibians — 41%**

- **Sharks and rays — 38%**

- **Conifers — 34%**

- **Selected crustaceans — 28%**

- **Mammals — 26%**

- **Reptiles — 21%**

- **Birds — 11%**

Birds are the most comprehensively assessed group on the list and show the lowest threatened share. That is not evidence that birds are safe — it reflects both genuine conservation success and the fact that complete assessment coverage includes the many common species that partial coverage of other groups tends to skip.

## Why the Red List changes in both directions

A species moving between categories is not always bad news, and not always news about the species. Reassessments happen for three quite different reasons:

- **The population genuinely changed.** The giant panda moved from Endangered to Vulnerable in 2016 after decades of habitat protection.

- **The evidence improved.** The snow leopard was downlisted from Endangered to Vulnerable in 2017 on the basis of better survey methods, not population recovery — an important distinction that was widely misreported at the time.

- **The taxonomy changed.** Splitting one species into three can create two newly threatened species overnight without a single animal being lost.

This is why we treat any status change as a prompt to check the assessment rather than a headline in itself.

## How WARN uses the Red List

We reconcile the conservation status published on our species guides against the current Red List, and we do it deliberately as a review step rather than an automatic overwrite. Automated matching fails in a specific and dangerous way: it matches at the wrong taxonomic rank. A naive sync would relabel our page on working donkeys with the status of the African wild ass, and replace the migratory monarch butterfly's Vulnerable listing with the Least Concern status of the species as a whole. Both would be wrong, and both would look authoritative.

Where our published status and the current Red List agree, we say so and link the assessment. Where they disagree, a person checks which is right before anything changes.

## What do people ask about this briefing?
### How many species are endangered?
More than 49,500 species are currently threatened with extinction on the IUCN Red List, out of 175,909 species assessed — about 28%. "Threatened" covers the Vulnerable, Endangered and Critically Endangered categories combined. The true global figure is unknown, because most species have never been assessed.

### How many animals are endangered?
The 49,500+ figure covers all assessed life, not only animals. Among animal groups specifically, 41% of amphibians, 38% of sharks and rays, 26% of mammals, 21% of reptiles and 11% of birds are listed as threatened.

### What percentage of species are endangered?
28% of the species assessed by the IUCN are threatened with extinction. This is not the same as 28% of all species on Earth — it is the share of the 175,909 species that have actually been evaluated, and assessment coverage is heavily skewed towards well-studied groups like mammals and birds.

### What is the difference between endangered and threatened?
"Threatened" is the umbrella term for three IUCN categories: Vulnerable, Endangered and Critically Endangered. "Endangered" is one specific category within it, meaning a very high risk of extinction in the wild. So every endangered species is threatened, but not every threatened species is endangered.

### How many species have gone extinct?
The IUCN lists species as Extinct only when there is no reasonable doubt the last individual has died, which requires exhaustive surveys. That evidentiary bar means the listed extinct total is a conservative floor, not an estimate of true extinctions — many species are believed lost without ever meeting the standard for formal listing.

### How often is the IUCN Red List updated?
The Red List is typically updated two to three times a year, with each release given a version number such as 2026-1. Updates add newly assessed species and revise existing assessments, so both the total assessed and the number threatened change with each release.

## Which sources does this briefing use?
- [IUCN Red List of Threatened Species (version 2026-1)](https://www.iucnredlist.org/)
- [IUCN Red List Strategic Plan 2021–2030](https://www.iucnredlist.org/about/barometer-of-life)

Human-readable page: https://worldanimalrescuenetwork.org/newsroom/how-many-species-are-endangered-iucn-red-list/