Number of described speciesNumber of species evaluatedNumber of species threatenedSpecies threatened as % of species describedSpecies threatened as % of species evaluated
Mammals5 4164 8631 0942022
Birds9 9569 9561 2171212
Reptiles8 2401 385422530
Amphibians6 1995 9151 8082931
Fishes30 0003 1191 201439
Subtotal59 81125 2385 7421023
Insects950 0001 2556230.0750
Molluscs81 0002 2129781.2144
Subtotal1 203 3754 1162 1080.1851
TOTAL1 263 18629 3547 8500.6227
Threatened species are those listed as Critically Endangered (CR), Endangered (EN), or Vulnerable (VU). The numbers and percentages of species threatened in each group do not mean that the remainder are all not threatened (i.e. are Least Concern). There are a number of species in many of the groups listed as Near Threatened or Data Deficient. These figures also need to be considered in relation to the number of species evaluated as shown in column 2.
Sources for numbers of described species:
Mammals: Wilson, D. E. and Reeder, D. M. (eds.) 2005. Mammal Species of the World. Johns Hopkins University Press, with deviations based on input from the IUCN/SSC Specialist Groups.
Birds: Provided by Birdlife International from their World Bird Database.
Amphibians: From AmphibiaWeb: Information on amphibian biology and conservation (web application). 2006. Berkeley, California: AmphibiaWeb. URL: http://amphibiaweb.org/ Accessed 20 August 2007.
Reptiles: Based on the New Reptile Database compiled by Peter Uetz and Jakob Hallermann. URL: http://www.reptile-database.org. Accessed 20 August 2007.
Fishes: Based on Froese, R. and Pauly, D. (eds.) Fishbase. World Wide Web electronic publication. URL: http://www.fishbase.org.version(07/2007). Accessed 20 August 2007.
Insects and Crustaceans: From Groombridge, Brian and Jenkins, Martin D. 2002. World Atlas of Biodiversity. California University Press, Berkeley; but in turn based largely on Hammond, P. M. 1992 and 1995. ‘Species inventory’ in Groombridge, Brian. Global Biodiversity: Status of the earth's living resources. Chapman and Hall, London.
Molluscs: From Bouchet, P. 2007. ‘Inventorying the molluscan fauna of the world: how far to go?’ in Jordaens, K., van Houtte, N., van Goethem, J., and Backlejau, T. (eds.) Abstracts of the World Congress of Malacology, Antwerp, Belgium.
Corals: Based on Spalding, M. D., Ravilious, C., and Green, E. P. 2001. World Atlas of Coral Reefs. Prepared at the UNEP World Conservation Monitoring Centre, University of California Press, Berkeley (Alcyonarian corals); and Cairns, S. D. 1999. ‘Species richness of recent Scleractinia’, Atoll Research Bulletin, 459: 1–46.
IUCN. 2007. 2007 IUCN Red List of Threatened Species. URL: http://www.iucnredlist.org/. Downloaded 28 November 2007.
From A Dictionary of Zoology in Oxford Reference.
Subjects: Zoology and Animal Sciences.