06 September 2019
Vol 365, Issue 6457

About The Cover

Cover image expansion

COVER In the Red Sea, a branching Acropora coral spawns pink egg-and-sperm bundles. These bundles will be carried by the currents until they encounter a match—a sperm fertilizes an egg and new life is created. Coral spawning usually occurs once a year in a certain month, on a specific night, and at a particular hour, but environmental changes are disrupting this synchronized event. See pages 987 and 1002.
Photo: Tom Shlesinger