BirdLife International is the official IUCN Red List Authority for birds and, in this capacity, coordinates the categorisation and documentation of all bird species for the IUCN Red List. In the latest assessment in 2013, 1,308 species (one in eight of the total) were considered threatened with extinction. Threatened species are not evenly distributed among bird families: there are particularly high proportions among albatrosses (77%), cranes (73%), parrots (29%), pheasants (21%) and pigeons (20%). Overall, larger-bodied species and those with low reproductive rates (owing to small clutch sizes) are more likely to be threatened.
Using the criteria and categories of the IUCN Red List (IUCN 2001), BirdLife International’s 2013 assessment of the world's birds concluded that 1,308 species (13% of extant species, or one in eight) are globally threatened with extinction (see figure a). These comprise 198 species classed as Critically Endangered (meaning that they are considered to be facing an extremely high risk of extinction; see figure b), 397 species assessed as Endangered (very high risk of extinction) and 713 listed as Vulnerable (high risk of extinction). An additional 888 species are considered Near Threatened because they are assessed as close to qualifying as globally threatened. Hence a total of 2,196 species or a fifth of all the world’s birds are treated as global conservation priorities. Only 60 species (0.6% of the total) are considered insufficiently known to be able to assess their threat status, and so are classified as Data Deficient.
Threatened species are not evenly distributed among bird families. There are particularly high proportions of threatened species among albatrosses (77%), cranes (73%), parrots (29%), pheasants (21%) and pigeons (20%). Furthermore, families and genera with few species have disproportionately high numbers of threatened species (Purvis et al. 2000). Even allowing for these taxonomic effects, larger-bodied species and those with low reproductive rates (owing to small clutch sizes) are also more likely to be threatened (Bennett and Owens 1997).
Compiled 2004, updated 2008, 2011, 2012, 2013
BirdLife International (2013) One in eight of all bird species is threatened with global extinction. Presented as part of the BirdLife State of the world's birds website. Available from: http://www.birdlife.org/datazone/sowb/casestudy/106. Checked: 12/12/2013
|Key message: One in eight of the world's birds faces extinction|