22 January 1988
Vol 239, Issue 4838

About The Cover

Dried intestinal contents of a hawksbill turtle (Eretmochelys imbricata). Glass-like needles are siliceous sponge spicules (ash content 92 percent of dry mass). The reef-dwelling hawksbill, endangered throughout its circumtropical range, feeds almost exclusively on choristid and hadromerid sponges in the Caribbean. See page 393. [Anne Meylan, Bureau of Marine Research, State of Florida Department of Natural Resources, St. Petersburg, FL 33701]