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Extinctions have probably been better documented for birds than any other group of animals. In total, 140 bird species have been classified as extinct since 1500. This excludes five species that have gone extinct in the wild, but that still have populations remaining in captivity. A number of other species currently categorised as Critically Endangered have probably gone extinct too, but cannot be designated as such until we are certain (Butchart et al. 2006). A total of 17 such species are categorised as Critically Endangered (Possibly Extinct) and one as Critically Endangered (Possibly Extinct in the Wild). Thus, a total of 163 bird species may have been lost in the last 500 years.
http://www.birdlife.org/datazone/sowb/casestudy/102