ECOLOGY:
Are Global Conservation Efforts Successful?
Ana S. L. Rodrigues
Global conservation efforts have prevented the extinction of 31 bird species over the past century, but these and many others may yet be lost as a result of continuing threats to their habitats.
The author is in the Department of Zoology, University of Cambridge, Cambridge CB4 1AD, UK. E-mail: aslr2{at}cam.ac.uk