Status of the World's Bird Species, 2005
Degree of Threat	Number of Species
Threatened
Critically endangered	179
Endangered	350
Vulnerable	679
Extinct in the wild	4
Total	1,212
Near-threatened	788
Non-threatened or Data deficient	7,775
TOTAL	9,775
Source: BirdLife International, "Birds on the IUCN Red List," 2005 Assessment, at www.birdlife.org.

 

Major Threats to the World's Birds, 2005
Threat	Percent of Threatened Species Affected
Habitat loss and degradation	87
Over-exploitation	29
Invasive species (excluding disease)	28
Human disturbance	13
Pollution	12
Natural disasters	12
Changes in native species dynamics	8
Incidental mortality	7
Disease (exotic or native)	5
Persecution	5
Source: Data provided by BirdLife International, www.birdlife.org, 2005.

Major Historical Threats Contributing to the Extinction of 150 of the World's Bird Species Since 1500
Threat	Species
	Number	Percent
Habitat loss and degradation	89	59
Invasive species	77	51
Over-exploitation	62	41
Natural disasters	8	5
Persecution	4	3
Changes in native species dynamics	4	3
Incidental mortality	3	2
Pollution	3	2
Human Disturbance	2	1
Source: S. H. M. Butchart, A. J. Stattersfield, and T. M. Brooks, "Going or Gone: Defining ‘Potentially Extinct’ Species to Give a Truer Picture of Recent Extinctions," Bulletin of the British Ornithologists' Club, in press.