<![CDATA[BirdLife case study of the day]]> en 27th Feb 2015 27th Feb 2015 <![CDATA[BirdLife case study of the day - We have lost over 150 bird species since 1500]]> A total of 163 bird species is believed to have become extinct since 1500. Avian extinctions are continuing, with 19 species lost in the last quarter of the twentieth century and three more known or suspected to have gone extinct since 2000. The rate of extinctions on continents appears to be increasing, principally as a result of extensive and expanding habitat destruction.