Contents

11 May 1990
Vol 248, Issue 4956

About The Cover

The hypothesis that endangered green turtles (Chelonia mydas) return to their natal beach to nest is supported by restriction fragment analysis of mitochondrial DNA. Thirty or more years may elapse before these high-seas travelers make their first return migration. Reproductive colonies are likely to be demographically independent and consequently must be managed on a colony-specific basis. See page 724. [Photograph by Anne B. Meylan]