California Colonies 



Catalog Total 



150 birds 

 = colony sites 



Percent of California 

 Breeding Population. 



Breeding Chronology 



Northern California 



Out*- 1 < 31 > 



Incubation Period - 42 days?? 

 Nestling Period * 70 75 day* ? ? 



Not Breeding 



lumbers in parentheses correspond to the 

 references from which we obtained the data. 



Central California 



No data available for Channel Islands populations. 

 Chronology constructed from dates of eggs collected J 



' Los Coronados Islands of Mexico. 



Jan. 1 Feb. | Mar, j Apr [ May [ June | July | Aug. | Sep. | Oct. | Nov. | Pec. 



Black Storm-Petrels are considerably larger than Ashy Storm-Petrels. 



Photo by Robert L. Pitman 



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