Contents

04 December 1998
Vol 282, Issue 5395

About The Cover

Cover image expansion

COVER Male and female American redstarts migrate from tropical wintering quarters to breeding areas in the United States and Canada each spring. Carbon isotope signatures from birds in the tropics provide a way to link events occurring during these two geographically distinct periods of the annual cycle. See page 1884. [Painting: John P. O'Neill, Museum of Natural Science, Louisiana State University]