---
title: "IUCN Critically Endangered (CR) Category — Definition"
description: "IUCN Critically Endangered (CR) is the highest extinction-risk rank for species, crucial for UPSC GS3 environment preparation and conservation efforts."
url: "https://modeldiplomat.com/learn/glossary/iucn-critically-endangered-category"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Critically Endangered is the highest threat category on the IUCN Red List for taxa not yet extinct, denoting an extremely high risk of extinction in the wild.
- What distinguishes Critically Endangered from Endangered on the IUCN Red List?
- Does a Critically Endangered listing create any legal obligation to protect the species?
- What does the 'Possibly Extinct' tag attached to a CR species mean?
- How often are Critically Endangered assessments reviewed?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Critically Endangered is the highest threat category on the IUCN Red List for taxa not yet extinct, denoting an extremely high risk of extinction in the wild.

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In 2020 the IUCN reassessed the European hamster (Cricetus cricetus) as Critically Endangered, citing a projected population collapse that placed the once-common rodent among taxa facing imminent extinction across France, Germany and Eastern Europe.

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