Masked booby (Sula dactylatra) adult on Christmas Island, Republic of Kiribati, central Pacific Ocean (12°N, 157°W). The booby was one of 18 species of tropical marine birds resident on the atoll whose breeding was temporarily terminated and whose populations disappeared during the 1982-83 El Niño Southern Oscillation. See page 713. [Ralph W. Schreiber and Elizabeth Anne Schreiber, Natural History Museum, Los Angeles County, Los Angeles, California 90007]

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