APRIL 1964 



Figure 22a. — Distribution of Sooty Tern, March-June 1964. 



/Long-tailecl/ Jaeger 

 Stercorarius longicaudus Vieillot 



Status : Rare spring and fall migrant. 



Four small jaegers, in all likelihood Long- 

 tailed Jaegers, were seen, two each in April 

 and May 1965. 



Many of the 15 jaegers observed but not 

 identified to species were probably Long-tailed 

 Jaegers. Ten of these were seen in April 1965, 

 two in September 1964, and three in October 

 1964. 



This species occurs in the study area only as 

 a migrant. The observations from April and 

 May were probably of birds migrating north- 

 ward through the study area to their breeding 

 grounds in Alaska or Siberia from an unknown 

 wintering area, presumably in the Southern 

 Hemisphere. The observations from September 



and October may well indicate a return migra- 

 tion through the area. 



Although four specimens taken by POBSP 

 personnel south and west of the study area 

 were of this species, some of the observations 

 of small jaegers not identified to species may 

 have been of Parasitic Jaegers. The latter 

 species has not yet been collected in the central 

 Pacific Ocean. 



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