The Top 5 Most Threatened Vertebrates (by class)

  Class of Vertebrate Percentage of species threatened
1 Reptiles 61%
2 Fishes 46%
3 Amphibians 31%
4 Mammals 23%
5 Birds 12%
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Tags: Threatened & Endangered Species, Top 5 Most

Sources:  IUCN 2004. 2004 IUCN Red List of Threatened Species.

List Notes: 
Most Threatened Vertebrates (by class)

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