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From Cambridge University Press
Table 3: Defining endangerment (IUCN 1996 criteria)
Untitled Document
| Category |
Probability of extinction
|
Time
|
| Critically endangered |
50%
|
10 yrs or 3 generations
|
| Endangered |
20%
|
20 yrs or 5 generations
|
| Vulnerable |
10%
|
100 yrs
|
Source: IUCN, 1996, IUCN Red List of Threatened Animals.
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