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List of critically endangered mammals

List of critically endangered mammals is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of critically endangered mammals rather than just read about it. In short: As of February 2026, the International Union for Conservation of Nature (IUCN) listed 238 critically endangered mammalian species, including 32 which are tagged as possibly extinct. Of all evaluated mammalian species, 3.9% are listed as critically endangered.

List of critically endangered mammals — main illustration
List of critically endangered mammals — illustration

Key takeaways

  • List of critically endangered mammals belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect List of critically endangered mammals to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of List of critically endangered mammals from memory before moving on to harder problems.

Reference excerpt

As of February 2026, the International Union for Conservation of Nature (IUCN) listed 238 critically endangered mammalian species, including 32 which are tagged as possibly extinct. Of all evaluated mammalian species, 3.9% are listed as critically endangered. The IUCN also lists 59 mammalian subspecies as critically endangered. Of the subpopulations of mammals evaluated by the IUCN, 21 species subpopulations have been assessed as critically endangered. Additionally 789 mammalian species (13.1% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed". This is a complete list of critically endangered mammalian species and subspecies evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such. Species and subspecies which have critically endangered subpopulations (or stocks) are indicated. Where possible common names for taxa are given while links point to the scientific name used by the IUCN.

Primates There are 88 species and 37 subspecies of primates assessed as critically endangered.

Gibbons Species

Great apes

Species

Subspecies

Lemurs

Species

Subspecies

Sportive lemurs Ahmanson's sportive lemur Holland's sportive lemur Mittermeier's sportive lemur Red-tailed sportive lemur

Tarsiers Species

Siau Island tarsier Subspecies

Natuna Islands tarsier

Old World monkeys

Species

Subspecies

New World monkeys Species

Subspecies

Lorisoidea Javan slow loris Bangka slow loris (possibly extinct) Mount Kenya potto (ssp. stockleyi, possibly extinct)

Odd-toed ungulates Species

Subspecies

Cetartiodactyls Cetartiodactyla includes dolphins, whales and even-toed ungulates. There are 15 species, nine subspecies, and nine subpopulations of cetartiodactyl assessed as critically endangered.

Non-cetacean even-toed ungulates

Species

Subspecies

Cetaceans Species

Baiji (possibly extinct) Vaquita Rice's whale North Atlantic right whale Atlantic humpback dolphin Subspecies

Subpopulations

Marsupials

Carnivora

Species

Subspecies

Subpopulations

Eulipotyphla

Lagomorpha Rabbits and relatives

Rodents There are 58 species and one subspecies of rodent assessed as critically endangered.

Hystricomorpha ("Porcupine-like")

Myomorpha There are 37 species in Myomorpha assessed as critically endangered.

Murids Includes mice, rats, gerbils, and relatives.

Cricetids Includes true hamsters, voles, lemmings, and New World rats and mice.

Nesomyids Mount Kahuzi climbing mouse

Sminthids Severtzov's birch mouse (possibly extinct)

Castorimorpha ("Beaver-like") Species

Subspecies

Alcorn's pocket gopher

Sciuromorpha Namdapha flying squirrel Vancouver Island marmot

Bats

Other mammals

Species

Subspecies

Sumatran elephant Subpopulations

Juliana's golden mole (1 subpopulation)

See also Lists of IUCN Red List critically endangered species List of least concern mammals List of near threatened mammals List of vulnerable mammals List of endangered mammals List of recently extinct mammals List of data deficient mammals

References

Illustrations

List of critically endangered mammals: Critically endangered (CR) species face an extremely high risk of extinction in the wild.
Critically endangered (CR) species face an extremely high risk of extinction in the wild.
List of critically endangered mammals: Western gorilla
Western gorilla
List of critically endangered mammals: Eastern gorilla
Eastern gorilla
List of critically endangered mammals: Bornean orangutan
Bornean orangutan
List of critically endangered mammals: Sumatran orangutan
Sumatran orangutan

Worked examples

Example 1 — a first encounter with List of critically endangered mammals

Start with the simplest possible case. Write down what List of critically endangered mammals claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of critically endangered mammals before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of critically endangered mammals ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of critically endangered mammals

In research
List of critically endangered mammals appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses List of critically endangered mammals in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
List of critically endangered mammals is common in secondary-school and first-year university syllabi. It links to neighbouring topics Critically endangered animals, IUCN Red List critically endangered species, Lists of animals by conservation status, so understanding it makes those chapters shorter.
In everyday life
Look for List of critically endangered mammals outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study List of critically endangered mammals in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what List of critically endangered mammals means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain List of critically endangered mammals out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of critically endangered mammals in simple terms?

As of February 2026, the International Union for Conservation of Nature (IUCN) listed 238 critically endangered mammalian species, including 32 which are tagged as possibly extinct. Of all evaluated mammalian species, 3.9% are listed as critically endangered.

Why does List of critically endangered mammals matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of critically endangered mammals?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of critically endangered mammals.

Tags

  • Critically endangered animals
  • IUCN Red List critically endangered species
  • Lists of animals by conservation status
  • Lists of mammals
  • Mammal conservation

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