Nesting green sea turtles (Chelonia mydas) on Isla Clarión, Islas Revillagigedos, Mexico by Frank T. Awbrey, Stephen Leatherwood, Edward D. Mitchell, and William Rogers. Bull. Southern California Acad. Sci., 83(2):69-75, 1984. Locations of green sea turtle (Chelonia mydas) nests were mapped and their density determined during beach surveys of Bahia Sulfur, Isla Clarion, Islas Revillagigedos, Mexico, conducted 9-1 1 October 1976. Based on 80 nests less than one year old in six sample quadrats, nest density was estimated as 0.027/m<sup>2</sup>. One old nest contained 76 spent eggs. At two other nests 89 and 92 hatchings were counted as they emerged. Possible annual turtle productivity in suitable areas of West Beach, Bahia Sulfur is estimated as 2.4 hatchlings/m-. Predation of hatchlings by ravens, various fishes, and possibly bottlenose dolphins was observed. At least 1 3 female turtles visited the beach during the three days. Several copulating pairs were observed and photographed.