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IUCN Categories of Threat | IUCN Data List | IUCN Red Data List | IUCN Wildlife Data

Shomu’s Biology
Shomu’s Biology•Apr 25, 2026

Why It Matters

Accurate IUCN classifications prioritize limited conservation resources, driving effective funding and policy decisions to prevent species extinction.

Key Takeaways

  • •IUCN Red List categorizes species from Least Concern to Extinct.
  • •Vulnerable, Endangered, Critically Endangered differ by decline percentages.
  • •Five quantitative criteria drive IUCN classification: decline, range, size, maturity, extinction risk.
  • •Geographic range thresholds: <2,000 km² Vulnerable, 500–5,000 Endangered, 10–100 Critically Endangered.
  • •Classification informs captive breeding programs and priority funding decisions.

Summary

The video explains the International Union for Conservation of Nature’s (IUCN) Red List, a global system that ranks species from Least Concern through Extinct. It serves as the primary tool for identifying which wildlife faces the greatest risk of disappearance and guides species‑specific preservation strategies such as captive breeding. Key insights include the three most urgent categories—Vulnerable, Endangered, and Critically Endangered—each defined by quantitative thresholds. The IUCN uses five criteria: population decline percentage, geographic range size, total population size, number of mature individuals, and modeled extinction probability. For example, a 30‑50% decline signals Vulnerable status, 50‑70% indicates Endangered, and 80‑90% marks Critically Endangered. The presenter highlights concrete thresholds: a geographic range under 2,000 km² classifies a species as Vulnerable, 500‑5,000 km² as Endangered, and 10‑100 km² as Critically Endangered. Similarly, population‑size metrics and extinction‑risk models have fixed numeric cut‑offs that determine the final category. These criteria translate complex ecological data into clear, actionable labels. Understanding these categories is crucial for conservation planners, NGOs, and investors. The Red List directs funding toward the most imperiled species, justifies legal protections, and shapes captive‑breeding programs, ultimately influencing global biodiversity outcomes.

Original Description

This lecture explains IUCN categories of threat | IUCN data list | IUCN red data list | IUCN wildlife data.
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