PI. 1 . Incubating red-tailed tropicbird, Bo'sun Bird Islet, Caroline Atoll, 25 September 1 988. The nest scrape is in fine coral rubble under 

 a Toumefortia shrub. 



PI. 2. Masked booby adult with egg on coarse coral rubble substrate with Portulaca mat. Nake Island. Caroline Atoll, 

 26 September 1988. 



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